---______ do you exercise?
---Once a week.
| A．How long | B．How often | C．How many | D．How old |
Kitty will stay here for _________ to help us.
| A．sometime | B．sometimes |
| C．some time | D．some times |
--Have you finished all of the exercises?---Yes, ________is left.
| A．None | B．Nothing |
| C．No one | D．Neither. |
I can’t say _____ I want to see you again. It’s two years since I saw you last .
| A．how long | B．how often |
| C．how soon | D．how much |
Yesterday morning I was just leaving---the telephone rang.
| A．when | B．while | C．because | D．since |
The teacher found him ______ and gave him some different homework to do every day.
| A．was clever | B．was a clever boy |
| C．a clever boy | D．clever boy |