---I’m not sure_____ Mr. Wang goes to see his parents ---Twice a week.A. how long B. how often C. how soon
---Did you get there by _____bike? --- No, I took _____taxi.
He’ll phone you as soon as he ________ Beijing .
It takes him too much time __basketball. He should spend more time __his homework.
He fell off the bike ________.
The students were all tired but ________ of them stopped ________.