We were swimming in the lake _______ suddenly the storm started.

The written record of our conversation doesn’t ________what was actually said. There are a lot of mistakes.

No student ______ go out of the school campus after 10:00 at night without permission according to the school regulations.

Only ten boys in our class use the Internet to get information, ______ use it to play games.

A smile________ nothing, but gives much.