1、黑洞产生很强的引力。

Black holes exert a strong gravitation pull. Gravity

2、由于管理不善，他的公司垮台了。

Because of bad management，his company collapsed.

3、80年代我国发射了多颗卫星。

Our country launched several satellites in the 1980s. (主动)

Several satellites were launched in our country in the 1980s.(被动)

4、药物开始见效了吗?

Has the medicine begun to operate?

5、他的身影消失在黑暗中。

His figure was swallowed up in the dark. By darkness.