I wondered why he ______ his job.
A.has changed
B.changes
C.used to change
D.had changed

Peter left half an hour ago. He ____ for you for a long time then.
A.was waiting
B.has been waiting
C.will be waiting
D.had been waiting

If I could speak Spanish, I ______ next year studying in Mexico.
A.will spend
B.had spent
C.would have spent
D.would spend

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