题目内容：

用括号内所给动词的适当形式填空。

1.Recently I listened a song ____     Heart Strings.(call)

2.The telephone               (invent) before the car.

3.The workers in the factory is made ______________ (work) 16 hours every day.

4.He said he ____________(be) a scientist some day.

5.Keep clean please. It is ____________(correct) to litter there.