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.