—What are you going to do tonight?
— ______. If I am free, I may go to the cinema with my mother.
| A．It depends | B．Forget it |
| C．It doesn’t matter | D．Don’t mention it |
About _____ of the world population is Chinese.
| A．one third | B．one fourth | C．one fifth | D．one sixth |
We should plant more trees on sides of the street.
| A．either | B．both | C．all | D．each |
your help, we can finish the task in time.
| A．Thanks to | B．Thanks for | C．Because | D．Thank |
— It’s one o’clock now. I must go.
— It’s raining outside. Don’t leave it stops.
| A．when | B．since | C．while | D．until |
— Must they clean and tidy the classroom now?
— No, they . It after school in the afternoon.
| A．mustn’t; must clean | B．needn’t; must clean |
| C．mustn’t; need be cleaned | D．don’t have to; can be cleaned |