1. The man was found unconscious at the foot of the cliff. He.....................have fallen 200 meters
C. should
D. mustn't
A. needn't
B. must

Exercise 4: Điền vào mỗi chỗ trống sau bằng một động từ khuyết thiếu đã học.
1. I left my bike here and now it's gone. Someone
have borrowed it.
2. "The door was open." "It_
have been open. I had looked it myself and the key was in my
pocket."
3. I want this letter typed, but you
do it today. Tomorrow you will do.
4. We
forget to shut the gates.
5. If you go to a dentist with a private practice, you
pay him quite a lot of money.
6. You
talk to other candidates during the exam.
7. "Have you seen John?" "No. But he
be studying in the library".
8. As I won't be at home tonight, I
do my homework during my lunch break.
9. Passengers
smoke until the signs have been switched off.
10. There are a lot of tickets left, so you
pay for the tickets in advance.
11. I
have worn my best suit to the party yesterday; everyone else was very casually
dressed.
go on a picnic with my
12. "What are you doing this weekend?" "I haven't decided yet. I
family."
I
do it now.
13. Can you repair my bicycle? -Oh, yes,
14. It's a secret. You
_let anyone know about it.
15. I'm not sure. I
come a few minutes late.
16. Secondary school students nowadays_
17. I had read the book last night before I went to bed. 1 never took it out of this room. It
wear uniform.
be
lying around here somewhere. Where
it be?
18. When you have a small child in the house, you_
leave small objects lying around. Such
objects
be swallowed, causing serious injury or even death.
take your umbrella along with you today. It
rain later on this afternoon.
19. You
take a taxi if I want to be on time.
20. I
be at the meeting by 10 pm I will probably

Exercise 3: Chọn phương án đúng
have fallen 200 meters.
1. The man was found unconscious at the foot of the cliff. He
C. should
D. mustn't
A. needn't
B. must
2 When the fog lifts, we
where we are.
A. could see
B. will be able to see
C. must have seen
D. are seeing
3. The swimmer was very tired, but he
the shore before he collapsed.
A. was able to reach
B. can reach
C. could reach
D. has reached
4. If a letter comes for me,
you please forward it to this address.
A. shall
B. could
C. must
D. should
5. I don't believe it. It
be true.
A. can't
C. shouldn't
6. Laura, you and the kids just have dinner without waiting for me. I
B. mustn't
D. wouldn't
work very hard
today.
A. can
B. may
C. should
D. would
7. Leave early so that you
_miss the bus.
A. didn't
B. won't
C. shouldn't
D. mustn't
8. He was very lucky when he fell off the ladder. He
himself.
A. could have hurt
B. should have hurt
C. must have hurt
D. will have hurt

19.Nobody knows how people first came to these islands.they..............have sailed from South America.
D. had
A. might
C. should
B. must
20. She felt ill and
leave early.
C. had to
D. ought
A. has to
B. must