--________does your father exercise? –Three times a week.
| A．How | B．How long |
| C．How often | D．When |
Mr.Green teachescomputer science.
| A．we | B．us | C．ours | D．our |
should not be allowed to go out at night.
| A．Twelve-years-old | B．Twelve-year-olds |
| C．Twelve year old | D．Twelve years olds |
is goodour body.
| A．Walking;at | B．Walk;for |
| C．Walking;for | D．To walk;at |
Great changesin China in the past 20 years.
| A．took place | B．were taken place |
| C．have taken place | D．have been taken place |
We will have a _____ holiday after the exam .
| A．two month | B．two-month | C．two-months | D．two months |