Tom does speak Chinese well, but his reading and writing skills leave much _______.
| A．to improve | B．to be improved | C．improving | D．improved |
When ________ questions in class, one should answer them as clearly as possible.
| A．asking | B．to ask | C．to be asked | D．asked |
It was not until I came here ____ I realized this place was famous, for not only its beauty but also its weather.
| A．who | B．that | C．where | D．before |
—How much shall I pay for the phone call?
—You________. This is free of charge.
| A．shouldn't | B．can't | C．don't have to | D．mustn't |
Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
| A．have run out | B．are running out |
| C．have been run out | D．are being run out |
—Have you got used to the Chinese food, Robert?
—Yes, but I don't like ________ when a Chinese host keeps serving me the food I don't like.
| A．this | B．that | C．those | D．it |