—Must I take part in the activity?—No, you _______. You’re too young. You should look after yourself. A. mustn’t B. can’t C. don’t have to
----Could you tell me _____? I must find him. ----Sorry. I have no idea. But he was here just now .
---I eat _____ vegetables and ______ meat than I did last year. ----That's why you're getting fatter.
The accident happened ______ a freezing winter morning.
----The pen writes well though it doesn't cost much. ---- Let me have a try. So _____.
---Does the child need any help? ----No. He is old enough to _____ himself.