If energy ______ inexpensive and unlimited, many things in the world would be different.
A.is
B.will be
C.would be
D.were

If you ______ to my advice in the first place, you wouldn’t be in this mess right now.
A.Listened
B.will listen
C.had listened
D.Listen

Unless you __________ all of my question, I can’t do anything to help you.
A.answered
B.answer
C.would answer
D.are answering

Choose the underlined part among A, B, C or D that needs correcting.
If I had finish (A) a course on (B) computer programming,(C) I would have (D) a better salary now.
A.had finish
B.on
C.programming
D.would have

Unless I don’t (A) go home early (B), please go shopping (C) and buy some food for lunch (D)
A.don’t
B.early
C.shopping
D.for lunch

If man continued destroying (A) the environment, his (B) life will (C) be affected (D).
A.A
B.B
C.C
D.D

If I had (A) known she was (B) ill, I would go (C) to visit her (D).
A.A
B.B
C.C
D.D

Choose the sentence which has the closest meaning to the original one.
Hung didn’t call Lan because it was too late.
A.Hung will call Lan, if it is early.
B.If it were not late, Hung would call Lan.
C.Hung didn’t plan to call Lan, but he changed his mind at the last minute.
D.If it hadn’t been so late, Hung would have called Lan.

They were exposed to biased information, so they didn’t know the true story.
A.If they got unbiased information, they could know the true story.
B.If they had unbiased information, they could have known the true story.
C.If they had been exposed to unbiased information, they would have known the true story.
D.If they have exposed to the unbiased information, they would have seen the true story.

.... you apologize for what you have done, I will never be your friend.
A.Unless
B.If
C.As if
D.Even if