How long did it take them to get ___ this river?A.through B,over C.across D.till
He asked the boy where .
How are you going to such problem ?
— Can you come?—You go first and I’ll ____ in a few minutes.
—Wang Lin is said to have studied in France for three years.—Really? No wonder he has a good ________of French.
The child asked his father ______ go out to play tennis.