3. Since I came here two years ago, great changes __________ in the factory and many people want to come here to pay a visit.

A have been taken place      B. had been taken place

C. have taken place          D. are taking place

4. There was a heavy curtain ________ the light.

A. blocking out      B. preventing from

C. blocking in       D. taking off

5. He said he _________ experiments those days.

A. was doing     B. had been doing    C. has been doing    D. is doing

6. In my opinion, life in the twenty-first century is much easier than _______.

A. that used to be     B. it is used to

C. it was used to      D. it used to be

7. It _________ we had stayed together for a couple of weeks ________ I found we had a lot in common.

A. was until; when        B. was until; that

C. wasn’t until; when      D. wasn’t until; that

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