.... you want to go out during a lecture, what should you do?
A.As
B.If
C.Though
D.When

If you won the lottery,....?
A.what will you do
B.what had you done
C.what would you do
D.what did you do

If the president…. last night’s train, he.... here now.
A.took / were
B.were taking / is
C.had taken / would have been
D.had taken / would be

If he.... more time, he.... decorating the baby’s room before she was born.
A.has / will have finished
B.had / would finish
C.had had / would have finished
D.had had / would finish

.... as much money as Bill Gates of Microsoft, I would retire.
A.If I had
B.If I have
C.Unless I had
D.If I had had

If it.... tomorrow, I will not have to water the plants.
A.will rain
B.is raining
C.would rain
D.rains

I.... the same car for more than ten years. I .... about buying a new one.
A.have had / am thinking
B.will have / think
C.had / will think
D.am going to have / was thinking

My best friend and I.... each other for over fifteen years. We still .... together once a week.
A.were knowing / got
B.knew / have got
C.have known / get
D.
had known / are getting

The secretary.... on the report for more than three hours. She hopes she may finish it by the lunch time.
A.is working
B.will be working
C.has been working
D.had been working

Please turn off the stove. The water.... for more than fifteen minutes.
A.is boiling
B.was boiling
C.has been boiling
D.will be boiling