用下列词组的正确形式完成句子。

1  .Li Hong is such a girl who can _______her attention her study for a whole class.

2. Yesterday a robber, who refused to give in, was _______and fired to death by the policeman.

3.  An old worker was found__________a painting of Tang Dynasty.

4.  On May Day, _________shoppers entered the supermarket,

5. She is a talented musician ___________a photographer.

6. When the earthquake happened,_________, about 150 students were having PE lessons on the

playground.

7. She looked through_________information for the report.

8.  __________to reach the mountain summit,they made preparations for everything.

9.  Practical experience, ____________,can give us more useful knowledge.

10. It is dangerous to_______the union.