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.

_______ at the cafeteria before, Tina didn’t want to eat there again.

Tom went off to the EXPO Garden with his friends, _____ an exciting day of discovering the unique (独特的) culture of each nation.

---Did the book give the information you need?--- Yes. But _____ it, I had to read the entire book.

There is ____ Mr. Smith at the door who wants to speak to you.

I have had my bike _______ , and I'm going to have somebody _______ my radio    tomorrow．

He was disappointed to find his suggestions ________.

________by the advances in technology, many farmers have set up wind farms on their land．

The suggestion ________ by the teacher is available.

Tom kept quiet about the accident ______ lose his job.

Can you imagine ______alone on that lonely island for the rest of your life?

He had no time to get his watch _______ in the nearest shop.

It is fairly common in Africa for _____ a group of musicians surrounded by others who also join in the performance.

Jack, who claimed ______ everything clearly, however, he told a lie.

 Mark Twain left school early,        make a fortune in South America.

 It was dark, but I could see a man        on the floor,       with a rope.