On Sundays there were a lot of children playing in the park, _______ parents were seated together joking.
| A．their | B．whose | C．which | D．that |
3. —How long are you staying there?
— _____depends.
| A．It | B．Anything | C．This | D．Everything |
4. I hate _______ when young people speak to the elderly in a rude way.
| A．this | B．that | C．it | D．One |
5.Is ____ necessary to complete the design before National Day?
| A．this | B．that | C．it | D．he |
6.I don’t think ____ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
7.Does ______ matter if he can’t finish the job on time?
| A．this | B．that | C．he | D．it |