_______ to the sunlight for too long will do harm to your skin.
A. Exposing B. Exposed C. Being exposed D. Having exposed
--- Congratulations![来
---Thank you. If it hadn’t been for your help, we ____ in the experiment.
A. will never succeed B. wouldn’t have succeeded
C. mustn’t have succeeded D. can’t have succeeded
---You _________to our Mom like that. It was awfully impolite.
---You are right. I must have been crazy at that moment.
A. mustn’t have talked B. needn’t have talked
C. shouldn’t have talked D. may not have talked
Electric trains have now _______ steam trains in England.
A. taken place B. in place of C. instead of D. taken the place of
The boy suggested that Tom ______ the problem another way, and Tom’s expression suggested that he_________.
A. should solve; agreed B. solve; agree C. solved; should agree D. solved; agreed
Everyone has periods in their lives ______ everything seems very hard.
A. when B. where C. which D. that