If your flight is delayed, call me from the airport.
A.Call me only if your flight is delayed.
B.Don’t call me until you arrive at the airport.
C.Give me a ring if your flight was delayed.
D.Give me a ring if your flight is delayed.

They went home after they ___ their work.
A.have finished
B.had finished
C.finished
D.would have finished

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