—The river smells so terrible! How did it come about?
—People used to pour dirty water into it.
| A．come out | B．happen |
| C．run | D．take place |
Mary __________ every day after school, but now she __________ all the time.
| A．used to play, is used to study |
| B．used to play, is used to studying |
| C．is used to play, used to study |
| D．is used to playing, used to study |
Could you please tell me how __________ to the post office?
| A．can I get | B．get | C．to get | D．getting |
I wonder __________ June is a good time to visit Hong Kong.
| A．whether | B．weather | C．that | D．When |
__________ salty potato chips they are!
| A．What | B．What a | C．How | D．How a |
My brother learns English __________ listening to tapes.
| A．for | B．by | C．with | D．From |