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She admitted _______ trouble ________ her studies and playing basketball.

___many times, the determined man didn’t give up and was finally offered a position in the firm.

Eric helped to explain some things about community medicine to Barack, and of course his ideas were affected by Barack _____ health care.

 In front of the Great Pyramid, Mr Lee stood _____ its great height, and asked many questions.

Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.

The most obvious reason why computer-based testing is becoming increasingly popular is that it makes tests easier ______.

The boss was _____ with the speech _____ by the graduate. Thus, he determined to give him a job offer.  

He was obviously annoyed，for he was not used to ________ like that.

________ to our study is the best way ________ high grades.

______ and happy, Tony stood up and accepted the prize.