B

B

What time do the food stands open ?  ( 10 a.m)

____________________________________ 

a.

They open at 10 a.m

b.

It opens at 10 a.m

c.

They open at 10 p.m

d.

It open at 10 a.m

 

There are four rooms in my house.

My house ____________________________

a.

has four rooms.

b.

have four room.

c.

have four rooms.

d.

has four room.

 

do you/ How often / to the / go / Hoang / to / cinema,  / ? / 

How often _________________________________________________

a.

How often Hoang do you go to the cinema ?

b.

How often do you go to the cinema , Hoang ?

c.

Hoang , How often do you go to the cinema ?

d.

How often do  go  you to the cinema , Hoang ? 

What time do the food stands open?  ( 10 a.m)

____________________________________ 

a.

They open at 10 a.m

b.

It opens at 10 a.m      

c.

They open at 10 p.m

d.

It open at 10 a.m

 

There are four rooms in my house.

My house ____________________________

a.

has four rooms.

b.

have four room.

c.

have four rooms.

d.

has four room.

 

do you/ How often / to the / go / Hoang / to / cinema,  / ? / 

How often _________________________________________________

a.

How often Hoang do you go to the cinema ?

b.

How often do you go to the cinema , Hoang ?

c.

Hoang , How often do you go to the cinema ?

d.

How often do  go  you to the cinema , Hoang ? 

Bài tập về Câu bị động :

1.    He opens the door every hour.

The door is opened every hour by him.

2.    He doesn't open the door every hour.

The door isn’t opened every hour by him.

3.    Does he open the door every hour?

Is the door opened every hour by him?

4.    Does she open the window every hour?

Is the door opened every hour by her?

5.    They don't open the drawer every minute.

The drawer isn’t opened every minute by them.

6.    Do they often open the wardrobe?

Is the wardrobe often opened by them?

7.    They always set the table in the evening.

The table is always set in the evening by them

8.    They never set the table for breakfast.

The table is never set for breakfast by them.

9.    They never serve breakfast in the room.

Breakfast in the room is never served by them.

10. Do they set the table for dinner?

Is the table for dinner set by them?

Will you open the door?

Open the door, will you?

Depending on the situation

C. File/ Save/ Đặt tên/ Save

C

1. “It’s so stuffy in here.” – “ _______ ”
A. Do I have to open the window?
B. Must I open the window?
C. Shall I open the window?
D. Would you like to open the window ?
2. “Merry Christmas!” – “ ______”
A. Happy Christmas to you!
B. Same for you!
C. The same to you!
D. You are the same!
3. “I will pick you up around 7:30. The movie starts at 8:00.” – “ ______ ”
A. No, you don’t.
B. OK. See you then.
C. I don’t like waiting.
D. Thanks, no big deal.
4. “ ______ going on a picnic this weekend?” – “That’s great!”
A. How about              B. Let’s             C. Why don’t we                D. Would you like
5. “Mr Green had an accident. He’s been in hospital for a week.” – “ _______ ”
A. How terrific.
B.Oh, is he?
C. Poor it.
D.Poor him.
6. “Do you really think that I should take the job?” – “ _______ Trust me. Take it.
What do you have to lose?”
A. I doubt so.            B. I don’t think so.          C. I hope so.                 D. I know so.
7. “Do you fancy a drink?” – “_____ ”
A. No, everything is OK.
B. Oh! Of course not.
C. Sure, let’s go and get one.
D. Wow! I am so excited.
8. “What are you doing here, Tom? Do you want to join us?” – “ ________ Please
continue. I’m just Corning to fmd my stuff.”
A. Don’t mind me.                       B. Don’t worry.
C. Not at all.                                  D. Not to mention.
9. “Take the second turning on the left and then go straight ahead until you see the
cinema on the right.” – “ _______ Thanlcs.”
A. I agree with you.                           B. I don’t think so.
C. I have got that.                               D. It makes sense.
10. “Do you mind if I turn on the volume?” – “ ______ ”  .
A. I don’t think so.                            B. I’m sorry, but you have to.
C. No, please go ahead.                    D. Of course, you can’t.
11. “Would you mind if I smoked?” – “ _______ ”
A. Don’t mention it.               B. I’d rather you didn’t.
C. Mind your head!                D. You don’t want to.
12. “Let’s have a pizza.” – “ _______ ”
A. It doesn’t matter.                     B. Not at all.
C. Not really.                                  D. Sure thing!
13. “It’s freezing outside! What happened to the weather report? I thought this
cold front was supposed to pass.” – “Yeah, _______ ”
A. I agreed with you.                                B. I thought so too.
C. That’s good point.                                 D. You are right.
14. “Let’s play Scrabble! I’m really good at spelling, too!” – “Oh, yeah?__________ ”
A. Does that make sense?                     B. I can’t believe in that.
C. I worry about it.                                   D. We’ll see about that!
15. ‘I’m really excited for Aunt Mary’s surprise birthday party this afternoon!
Aren t you?” – ______ ”
A. Oh! I didn’t know she was older.
B. Really? What happened next?
C. Uh-huh! What then?
D. Yeah! How old is she?

Lời giải:

$x^{50}+x^{49}+x^{48}+....+x^2+x+1$

$=(1+x+x^2+...+x^{16})+(x^{17}+x^{18}+....+x^{33})+(x^{34}+x^{35}+...+x^{50})$

$=(1+x+x^2+...+x^{16})+x^{17}(1+x+x^2+...+x^{16})+x^{34}(1+x+x^2+...+x^{16})$
$=(1+x+x^2+...+x^{16})(1+x^{17}+x^{34})\vdots 1+x+x^2+...+x^{16}$

Đáp án D

open: mở >< close: đóng

tl đúng cho like

21.B

22.B

23.A