Tim often helps the old man in his free time.A . when he is hungryB. when he is not with anyoneC. when he isn't busy
Mr. Smith teaches ________ science. We all like ________classes very much.
Our school has a school trip ________ October 15th.
Can you ________ it ________ English?
We can ________ some food________ the supermarket.
We have sweaters ________ all colors ________ ¥50 each.