According to the latest study，most traffic accidents     be prevented if drivers are careful enough．

When disaster strikes, you _____ find yourself without water, gas and electricity.

This book _______ be Tom’s. Look! His name is on the cover.

 You _____ get the machine repaired this week. I won’t need it until next month.

He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.