People ______always be careful with fire, or it can be dangerous.
It’s time to say goodbye to my school.I’ll always remember the people have helped me.
–Smoking should in school.--I agree. It’s bad for our health.
The boy asked his father .
Would you mind me how this math problem ?
–I think Mr Zhang may be in his office.--No, he be there. I saw him just now.A. needn’t, left B. mustn’t, leavingC. can’t, leave C. shouldn’t, leave