The problem of the polluted river_____ right away to prevent possible danger to the local people.[ ]

To make members of a team perform better, the trainer first of all has to know their ______ and weaknesses.

Sam becomes the top student because heis very clever.—_______. Without the help of hishardworking teachers, he can’t make it at all.

There is no possibility ______ all the students can pass the college entrance examination.

Though it was raining,they________working until it was finished.[ ]