--_______ does she chat with friends on the Internet?
--Once a week.
| A．How long | B．How much | C．How many times | D．How often |
The population of the world ____ still ____ now.
| A．has; grown | B．is; growing | C．will; grow | D．is; grown |
There's _________800-metre-long road behind _________hospital.
| A．an,an | B．a, a | C．an, the | D．a, the |
——You have a fever. What’s the matter with you?
——H7N9 is coming now. I have to see the doctor.
| A．wrong . | B．worry | C．illness | D．pain |
The boys and girls follow Yao Ming all the time.
| A．go after | B．go in for | C．look after | D．look for |
The paintings are on show in the history museum.
| A．on time | B．on watch | C．on duty | D．on display |