1. I was stuck at that traffic jam for hours!               ...I've been stuck in traffic for hours!​..................

2. There were no clouds on the sky                       .........No clouds in the sky .....................

3. Matthew was in work when I called                        ..........Matthew was working when I called ...............

4. Megan will be on the office from nine to four.            ............Megan will be in the office from nine to four hours. ...................

5. Rachel is to her desk                                         .............Rachel arrives at her desk .................

6. There will be many new people on the party              .........There will be many new people at the party .................................

7. The food is in the table                                         ........Food on the table .......................

8The keys were not to his pocket.                          ............The key is not in his pocket. .......................

9. She looked in herself  and smiled happily            ..........She looked at herself and smiled happily ..................

10. The books were at the shelf                          ...........the books are already on the shelf....................

Tự làm nên ko biết đã đúng chưa đâu -.-"

1 Complete the sentences withmissing preposition of place.

1 My mother's portrait is in the fireplace.

2 Is.the left there is a window

3 We had dinner is a very nice restaurant.

4 The dinner will be for .Mark's

5 The cat is sleeping on the sofa

6. A big lamp is hanging on the table.

7 The taxi will be waiting at the hotel.

8. There is a beautifful garden right the back of the house.

9 Go the left you can see a monument

10. He was sitting at the top of the stairs

1 Complete the sentences withmissing preposition of place.

1 My mother's portrait is...ON...................the fireplace.

2.............................the left there is a window

3 We had dinner..............IN..........a very nice restaurant.

4 The dinner will be ...............Mark's

5 The cat is sleeping..ON........the sofa

6. A big lamp is hanging..........BEHIND......the table.

7 The taxi will be waiting................the hotel.

8. There is a beautifful garden...................the back of the house.

9.......................the left you can see a monument

10. He was sitting.................the top of the stairs

CÁI NÀY  LÀ THÊM NƠI CHỐN  MÀ NHỈ ==" SAO THÊM VÀO THẤY KO HỢP LÝ CẬU Ạ ==' CÓ THIẾU ĐỀ KO?

nhưng cũng có khản năng tớ ngốc :"

1 Complete the sentences withmissing preposition of place.

1 Who is that boy sitting.....with...........Ann and Liz?

2 There were many beautiful flowers......in...the garden.

3. We used to live.....on..........the third floor.

14 Bob is writing ......on...the copy book

15. There is such a mess.....in.......the kitchen!

9 A lot of stars are..with.....us

Ax//Bz => ^Bax = ^ABz = 30 (góc so le trong) => ^CBz = ^ABC - ^ABz = 55-30=25

=> ^CBz + ^BCy = 25+155=180 => Bz//Cy (Hai đường thẳng bị cắt bởi 1 cát tuyến tạo thành 2 góc trong cùng phí bù nhau thì 2 đt đó // với nhau)

Mà Ax//Bz

=> Ax//Cy (cùng // với Bz)

Đặt x/-4=k => x=-4k

      y/-7=k => y=-7k

      z/3=k  => z=3k

=> A=8k+7k+15k / -8k+21k-18k

     A=30k / -5k

=> A=-6 

1, The doctor told Elena that she should sleep more or she try to relax more.

2, Eating carrots will help you see object more clearly at night.

3,  Vitamins play an important role on our diet