complete the following sentences with could/should/shouldn't/must +have +PII or should/must +V

1. Susan failed her Economics 201 last term. She............very upset (be).
2. This computer isn’t fast enough. I know. I………….a better one, but I didn’t have enough
money when I bought this last month. (buy)
3. Why did you stay at a hotel when you went to New York? You………with Barbara. (stay)
4. Jack fell off a ladder yesterday but he’s all right. He’s lucky he……… himself badly.(hurt)
5. The situation was bad but it………worse. (be)
6. You have been traveling all day. You ………tired (be)
7. I’ve lost one of my gloves. I …………it somewhere (drop)
8. Carol …………very bored in her job. She does the same thing everyday.(get)
9. Jane walked past me without speaking. She…………me (see)
10. The phone rang but I didn’t hear it . I ……………asleep (be)
11. I haven’t seen the people next door for ages . They…………….(go away)
12. That restaurant……………very good. It’s always full [full]of people. ( be)
13. That restaurant …………very good. It’s always empty. (be)
14. It rained every day during their holiday, so they………………a very nice time (have)
15. Congratulations on passing your exam. You………………very pleased .(be)
16. Bill and Sue go away on holiday very often, so they………………short of money ( be)
17. Ted isn’t at work today. He………………ill. ( be)
18. Ted wasn’t at work last week. He………………ill( be )
19. Carol knows a lot about films. She………………to the cinema a lot. (go)
20. It was a great party last night. You ………………Why didn’t you? (come)
21. I’m feeling sick. I………………so much chocolate . ( eat)
22. You look tired . You ………………to bed now (go)
23. You went to bed very late last night . You………………to bed earlier.(go)
24. I wonder why they are so late. They………………here an hour ago.( be)
25. I’m sorry I didn’t take your advice . I ………………what you said (do)
26. She was too far away, so she ……………… you.( not /see)
27. Don passed the exam without studying for it. The exam ………………very difficult ( be)
28. She knew everything about our plans. She………………to our conversation (listen)
29. The lights were red but the car didn’t stop. The driver………………the red light ( see)
30. The trip was canceled last week. Paul ……….anyway because he was ill (go)

1.It's essential that he ____. His illness seems worse

A.need an operation

B.needs an operation

C.need to operate

D.needed operating

2.It's essential_____

A.for everyone know what to do in case of fire

B.that everyone know what to do when there is a fire

C.that everyone to know what to do when there is a fire

D.for everyone knows what to do in case of fire

3.The teacher insists ___ homework regularly

A.that the student do

B.that the student does

C. the student to do

D.that the student is doing

4. it is critical that the researcher ___ everything clearly to the participants before asking them to complete the questionnaire

A.must explain

B.explains

C.explain

D.is explained

5. they ___that the theater be demolished to make way for the new shopping center

A.propose

B.promised

C.hoped

D.tendered

6. it was essential that we ____ the lease before the end of the month

A.sign

B.signed

C.had signed

D.were signing

Những trở ngại ngăn cản các sinh vật giao phối với nhau được gọi là cơ chế nào?

A. Cách li cơ học

B. Cách li sinh sản

C. Cách li tập tính

D. Cách li trước hợp