题目内容：

 

1.Visitors __________________(request) not to touch the exhibits(展品).

2.It’s no pleasure _________________(work) with you.

3.You can’t imagine what great trouble they have _________________(solve) the problem.

4.There are a lot of children ___________(play) on the playground.

5.It has been 3 years since he _________________(join) the army.

6.With so much work ________________(fill) my mind, I almost break down.

7.Alexander tried to get his work _________(recognize) in the medical circle.

8.While _______________(walk) the dog, I was careless and it got loose.

9.I am only able to look at nature through dirty curtains __________(hang) before very dusty windows.

10.Many people believe the English ______________(speak) on TV and the radio is standard English.