It ____ be our headmaster. He has gone to Beijing.
| A．mustn’t | B．won’t | C．may not | D．can’t |
Does ______ matter if he can’t finish the job on time?
| A．this | B．that | C．he | D．it |
I don’t think ____ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
Is ____ necessary to complete the design before National Day?
| A．this | B．that | C．it | D．he |
I hate _______ when young people speak to the elderly in a rude way.
| A．this | B．that | C．it | D．one |
—How long are you staying there?
— _____depends.
| A．It | B．Anything | C．This | D．Everything |