1 . By the time the city half-marathon began, all potential problems ________(handle) carefully. (所给词的适当形式填空)

2 . When my breathing returned to normal, I reflected on what __________ just __________ (achieve). (所给词的适当形式填空)

4 . The classroom ________(clean) before the teacher came, so the floor and windows are very clean. (所给词的适当形式填空)

5 . That was the first time that she ________ (invite) to visit the Great Wall, which made her extremely delighted. (所给词的适当形式填空）

6 . John went to the hospital alone. If I ______(tell) about it, I would have gone with him.

7 . The report found that safety equipment had been very poorly ______（保养）. （根据汉语提示单词拼写）

8 . By the time of the ban was finally lifted, he ________ at the airport for more than two weeks.

A．was stuck

B．had been stuck

C．has been stuck

D．had stuck

9 . —Why didn’t you attend the meeting yesterday?
—Well I ______ anything about that.

A．didn't tell

B．haven't told

C．hadn't been told

D．haven't been told

10 . In the 1980s in this village, there were only muddy roads to the outside, and concrete ones ________ yet.

A．haven’t built

B．haven’t been built

C．hadn’t built

D．hadn’t been built