— Is your mother still a teacher?
— ______.
| A．Yes, she was | B．She didn’t use to |
| C．No, but she used to | D．No, but she used to be |
18. ---- Are you free after school?
---- Sorry. I’ve planned to treat a friend of mine to dinner _______for his help.
| A．in charge | B．in honour | C．in turn | D．in return |
17. Is this research center _________ you met some foreign guests last week?
| A．that | B．where | C．which | D．in which |
16. ---- How long has this church been in service?
----_________1682, I’m afraid.
| A．After | B．In | C．From | D．Since |
15. _______ the day went on, the weather got worse, which made it impossible for them
to go down the mountain.
| A．With | B．Since | C．While | D．As |
14. ---- Is it Tom that playing basketball?
---- It __________ be him. He is so crazy about basketball.
| A．might | B．should | C．can | D．Would |