—______ do you write to your pen friend?
—Once a week.
A. How long B. How soon C. How often
Having ________ exercise every day will do great good to your health.
| A．a lot | B．a number of | C．too much | D．plenty of |
— I’m new in Wuxi.
— Take a map of Wuxi with you. You’ll find it of great ________ in helping you to get round Wuxi.
| A．price | B．cost | C．interest | D．importance |
Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.
| A．mustn’t | B．ought not to | C．needn’t | D．don’t have to |
Boris has brain. In fact, I don’t think that anyone in the class has ________ IQ.
| A．a high | B．a higher | C．the higher | D．the highest |
— What do you think of the young lady?
— She is hard-working. She ________ all her effort into her work before she got ill.
| A．has put | B．put | C．had put | D．would put |