You’ll certainly feel lonely ______ you communicate with your friends sometimes.

. The old man, who _______ the World War II, is Peter’s grandfather.

_______ work did we have to do that we were soexhausted

Did it _______ you 4 hours to get to Shanghai last week —Yes, just 4 hours by bus.

What impresses me most is________he appears in front of others，he wears a sincere and charming smile