–Do you know where David is? I couldn’t find him anywhere. – Well. He _____ have gone far — his glasses are still here.

According to the school rules, no child _______ be allowed out of the school during the day, unless accompanied by an adult．

Students  ______ remain in their seats until all the exam papers have been collected.

This is his only request that the room ______ after being used.

I_______ have watched that movie —it’ll give me horrible dreams.