-Must I take part in the activity?-No, you _________.A. mustn’t B. don’t C. don’t have to
I believe _____ important to have a rest when you feel very tired.
Don’t stop working _____ twelve.
It’s important to eat a _____ diet.
–Excuse me, _____ ?--It’s windy.
--_____ with you? --I have a score throat.