While________ along the road, Mr. Smith met an old friend of his.

Tom_____to several companies after he resigned his position as vice president, but he was rejected over and over again.

When he was 20,he left school and went to Beijing,________he made great progress and becamean engineer[ ]

The man showed us so heavy a stone ________ no man can lift.

u have the time－Sorry, I have no watch－_____________