1.b were/would be

2.a Should she

3.c had listened

4.c should

5.a shines/will go

6.b wouldn't have been canceled/hadn't rained

7.d would have never been

8.d hadn't left/would have had

9.a were/would know

10.b had studied

11.b unless/for

12.d whether/or

13.c If I were you, I would stop smoking 

14.b melts

15.c or

16.d If you want to get ahead in this company, you have to be prepared to work long hours

17.c Don't forget to keep in touch with me is you come to Singapore

18.b I never buy something that I can't afford

19.b The police want to talk to anyone who saw the man

20.d What should we do with someone who starts the fire?

21.a if they're

22.b have

23.d unless

24.d may

25.b had checked/would not have got

26.d If he hadn't stepped on the mine, it wouldn't have explored

27.c If you cool the liquid to 32 degrees, it froze

28.b If it rains, the match will be canceled

29.c If I knew Philosophy, I would be able to answer your question

30.c Because the bag was heavy so we could not take it with us

31.a If

32.d were/could enjoy

33.d would have found

34.d would have had

35.b had happened

36.a will happen/can fly

37.c Due to the strong wind, the cottage collapsed

38.d Or you will get an accident

39.d If I had not behaved so impolitely with her, she would not be disappointed

40.c unless

41.a is you are polite to them

42.a in case it rains 

43.c will only make

44.c can speak

45.c or

46.a come

47.a unless a doctor is sent for

48.d so

49.c unless he had passed all the test

EX1

1.a-were

2.d-to do

3.b-x

4.a-i had known

5.b-had known

6.a-have finished

7.b-confidently-adv

8.c-would not have been

9.a-were i to know

10.d-would have stoped

11.a-you had sent

12.b-conservation of

13.b-spent-thức giả định

14.c-sacked

15.would

16.a-had found

$Làm$

13.C

14.b

15.C

16.D

17.C/D

18.B

19.B

20.D

21.A

22.B

23.D

24.D

25.B

26.

27.

28.B/A

29.C

30.C

31.B

32.D

33.C

34.D

35.B

36.A

37.

38.D

39.D

40.B

41.A

42.A

43.C

44.C

45.C

46.A

47.A

48.D

49.C

$#Don$