Are Mr. and Mrs. Wang living alone in the house? —-Yes, altough they have three sons, of them live with their parents.

Don’t hurry. There are twenty minutes left. It’s _____ for us to get to the cinema.

Jack is a successful writer. He devotes all his energy ______ the novels.

What were you doing when the earth quake happened in Jilin?—I________TV when I heard the news.

Every year lots of trees ________ to make our country more beautiful.