By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.
The world seemed as if it was ___________. In a flash everything was destroyed.
There was _________ no wind and the air was very hot.
---Where did you find your wallet? --- It was in the shop _______ I bought the shirt.
We talked about the things and persons _______ we remembered at school.
When he heard the _______ news that an earthquake occurred in Sichuan, he felt very___________.