• Beaches are visited by many tourists to relax and enjoy the sun.

• She asked if I was planning to book a guided tour of the national park.

• Exploring new cultures will broaden your horizons.

• They spent last summer staying in a cozy cabin in the mountains.

• Although the weather was rainy, they hiked to the waterfall.

56. Many tourists visit beaches to relax and enjoy the sun.

→ Beaches ............are visited by many tourists to relax and enjoy the sun....................................................................................................................................

57. “Are you planning to book a guided tour of the national park?” she asked.

→ She asked..........if I was planning to book a guided tour of the national park...................................................................................................................................

58. If you explore new cultures, you'll broaden your horizons.

→ Exploring...........new cultures, you will broaden your horizons...................................................................................................................................

59. They stayed in a cozy cabin in the mountains last summer.

→ They...spent last summer staying in a cozy cabin in the mountains....................................................................................................................................................

60. Despite the rainy weather, they hiked to the waterfall.

→ Although........the weather was rainy, they hiked to the waterfall.......................................................................................................................................

56. Many tourists visit beaches to relax and enjoy the sun.

→ Beaches ............are visited by many tourists to relax and enjoy the sun....................................................................................................................................

57. “Are you planning to book a guided tour of the national park?” she asked.

→ She asked..........if I was planning to book a guided tour of the national park...................................................................................................................................

58. If you explore new cultures, you'll broaden your horizons.

→ Exploring...........new cultures, you will broaden your horizons...................................................................................................................................

59. They stayed in a cozy cabin in the mountains last summer.

→ They...spent last summer staying in a cozy cabin in the mountains....................................................................................................................................................

60. Despite the rainy weather, they hiked to the waterfall.

→ Although........the weather was rainy, they hiked to the waterfall.......................................................................................................................................

please giúp nhanh với mọi người ơi

51 enthusiastically (đằng sau có prepare là động từ nên cần trạng từ để bổ nghĩa)

52 adventurous (đằng sau là outdoor activities là danh từ nên dùng tính từ để bổ nghĩa)

53 to modify (decide to V)

54 skillfully (đằng sau là động từ craft nên dùng trạng từ để bổ nghĩa)

55 entertainingly

`{(-6x + 3y = -3),(-10x - y = -5 - 3xy):}`

`<=> {(-2x + y = -1),(-10x - y = -5 - 3xy):}`

`<=> {(y =2x -1),(-10x - y = -5 - 3xy):}`

`<=> {(y =2x -1),(-10x - (2x -1) = -5 - 3x(2x -1)(1)):}`

Từ (1) `<=> -10x - 2x + 1 = -5x - 6x^2 + 3x`

`<=> 6x^2 - 3x + 5 -10x - 2x + 1 = 0 `

`<=> 6x^2 - 15x + 6 = 0`

`<=> 2x^2 - 5x + 2 = 0`

`<=> (2x^2 - 4x) - (x - 2) = 0`

`<=> 2x(x-2) - (x-2) = 0`

`<=> (2x - 1)(x-2) = 0`

<=> \(\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=2\end{matrix}\right.\)

Hệ phương trình <=> \(\left\{{}\begin{matrix}\left[{}\begin{matrix}x=\dfrac{1}{2}\\x=2\end{matrix}\right.\\y=2x-1\end{matrix}\right.\)

<=> \(\left[{}\begin{matrix}\left\{{}\begin{matrix}x=\dfrac{1}{2}\\y=0\end{matrix}\right.\\\left\{{}\begin{matrix}x=2\\y=3\end{matrix}\right.\end{matrix}\right.\)

Vậy ...

11) expands

12) will be cold

14) would you do

15) water

16) give

17) wouldn't have taken 

18) won't find

20) notify

11 expands

12 will be

13 would have been

14 would you do

15 water

16 gave

17 wouldn't have take

18 won't find

19 do

20 notify

c: \(P=\frac{\sqrt{x^3}-\sqrt{y^3}}{x-y}-\frac{x}{\sqrt{x}+\sqrt{y}}-\frac{y}{\sqrt{y}-\sqrt{x}}\)

\(=\frac{x\cdot\sqrt{x}-y\sqrt{y}}{x-y}-\frac{x}{\sqrt{x}+\sqrt{y}}+\frac{y}{\sqrt{x}-\sqrt{y}}\)

\(=\frac{\left(x\sqrt{x}-y\sqrt{y}\right)-x\left(\sqrt{x}-\sqrt{y}\right)+y\left(\sqrt{x}+\sqrt{y}\right)}{\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)}\)

\(=\frac{x\sqrt{x}-y\sqrt{y}-x\sqrt{x}+x\sqrt{y}+y\sqrt{x}+y\sqrt{y}}{x-y}=\frac{x\sqrt{y}+y\cdot\sqrt{x}}{\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)}\)

\(=\frac{\sqrt{xy}\left(\sqrt{x}+\sqrt{y}\right)}{\left(\sqrt{x}-\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}\right)}=\frac{\sqrt{xy}}{\sqrt{x}-\sqrt{y}}\)

\(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)

\(n_{NaOH}=0,3.1=0,3\left(mol\right)\)

\(\dfrac{n_{NaOH}}{n_{CO_2}}=\dfrac{0,3}{0,2}=1,5< 2\)

Pứ tạo muối axit trước.

\(CO_2+NaOH\rightarrow NaHCO_3\)

0,2----> 0,2 ----->  0,2

\(NaOH+NaHCO_3\rightarrow Na_2CO_3+H_2O\)

0,1------> 0,1 ----------> 0,1

Giả sử thể tích dung dịch thay đổi không đáng kể.

\(CM_{NaHCO_3}=\dfrac{0,2-0,1}{0,3}=\dfrac{1}{3}\left(M\right)\)

\(CM_{Na_2CO_3}=\dfrac{0,1}{0,3}=\dfrac{1}{3}\left(M\right)\)

1. He would have solved the puzzle had he watched the news.
2. If I had had a mobile, I could have phoned you.
3. Were I to ask you to lend me your dictionary, would you do it?
4. The money will only be paid should a new contract be signed.
5. I’d appreciate it if you would reply at your earliest convenience.
6. If only I had known you earlier.
7. But for your absent-mindedness then, the soup would have tasted excellent.
8. They would have paid less if they had booked the tickets yesterday.
9.If you like, you can stay for two days.
10.If the parents were to buy the cat, their children would be very happy.

As long as you follow the instructions carefully, there won't be any problems.