题目内容

4.The new employees had to go over the safety regulations several times ______ they understood them.

A. since
B. before
C. unless
D. when

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5.By the end of next year, I ______ for the company for 10 years.

A. work
B. am working
C. had worked
D. will have worked

6.______ arriving at the meeting room, Tina discovered that she had left the sample products in her office.

A. By
B. Through
C. On
D. In

8.Miss Smith's assistant enjoys ______ for her although she treats him very strictly.

A. work
B. working
C. to work
D. worked

9.Tom might not have made such a serious mistake if he ______ your advice.

A. followed
B. follows
C. had followed
D. has followed