1. All kinds of techniques and medicines ______ to extend human beings life in recent years.
A. have developed
B. were developed
C. are being developed
D. develop
2. A week after the interview, he received a letter ______ him the job.
A. offering
B. to offer
C. offered
D. offer
3. Working part-time while ______ the same standard of living seems like everyone’s dream.
A. preserving
B. maintaining
C. manipulating
D. persisting
4. “Susan, I’d like to talk to you alone,” said the teacher, clearing the room ______ other people.
A. from
B. with
C. of
D. off
5. Attachments ______ to your Hotmail account can be downloaded to your personal computer by clicking them.
A. sending
B. to send
C. sent
D. are sent
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