People under stress ______ express their full range of potential.[ ]

The survey ____ in our school last monthshows that about three percent of the students are addicted to the Internetgames.

I wanted to explain, but he didn’t give me any _______.

My uncle _____ Beijing next week. He ishaving a meeting there.

The driver _____ have drunk a lot before the accident, but I’m not quite sure of that.