题目内容：

在下列个句中的空白处填入一个适当的词，或用括号中所给词的正确形式填空：

1.The teacher, together with some of her students, ___(be) preparing for their performance now.

2.It is dangerous to carelessly throw about ____(light) cigarettes like this.

3.He made every effort to seek a position __ he could get a higher salary and a quick promotion.

4.The doctor left hurriedly without a word and came back after __ seemed to be half an hour.

5.It made us overjoyed to hear that he is __(admit) into Beijing University.

6.Do you see the sign over there? They don’t allow ___(take) photos here.

7.Great achievements ____ (make) in the field of medicine in the past ten years, and people are enjoying better medical care now.

8.It is widely accepted that honesty is the best policy. At __ time should we cheat in exams.

9.You shouldn’t expect too much from them. ___________ all, they are just beginners.

10.The building that ___(build) there is for us teachers, so though there is much noise all the time, we still feel happy.

11.Little Johnny has gone hiking with three of his friends and his mother was ___(terrible) concerned about his safety.

12.Great attention should be paid to ___(protection) the endangered animals because when we lose some species, we will put ourselves in danger.

13.Human facial expressions differ from those of animals in the degree___ which they can be controlled on purpose.

14.Jenny ____ have been there at that time because she was here with me all day yesterday.

15.With all his attention ___(fix) on what he was reading, he didn’t notice them slip into the room.