—_______ do you go walking? — Three times a week.
| A．How long | B．How much |
| C．How often | D．How many |
Though the player is over forty, he can run ___________ some younger players.
| A．much fast than | B．more faster than | C．so fast as | D．as fast as |
Don’t ___________ your dictionary all the time when you meet new words.
| A．work on | B．take on | C．depend on | D．keep on |
It is difficult __________ you ___________ finish the work in a week.
| A．of, to | B．with, to | C．with, for | D．for, to |
I can’t understand ____________ the boy alone.
| A．why did she leave | B．why had she left | C．why she left | D．why she had left |
They asked many questions ___________ had nothing to do with that topic.
| A．which | B．who | C．where | D．when |