--________ does your father visit your grandparents a week? –Once.
| A．How often | B．How many times | C．How long | D．How soon |
--________ do you have PE? –Every Monday, Wednesday and Friday.
| A．How often | B．How long | C．How many times | D．What time |
We have to work for ________ to finish the work.
| A．another two hours | B．more two hours | C．two another hours | D．other two hours |
The sea water is _______ for anybody to ______.
| A．enough warm, swim | B．enough warm, swim in |
| C．warm enough, swim | D．warm enough, swim in |
The plane couldn’t take off on time _____ the heavy rain.
| A．because | B．so that | C．because of | D．as |