1.He ran faster------(catch)up with his chassmates.

1.He ran faster______(catch)up with his chassmates.
2.Miss Green made the boy______(stay)at home all day.
3.The news______(surprise)everyone last night.
4.She got a gold medal in______(swim).
5.Keys are used for______(open)doors.
6."I have two teeth,too"he said______(show)his teeth.