---Angela, you are going to buy a flat here, aren’t you?
---Yes, but I can’t _____ an expensive one.
A. spend B. cost C. pay D. afford
---What ______ the number of students in your school?
---About two thousand. A number of them _____ from the countryside.
A. is, are B. is, is C. are, is D. are, are
Ben is a foreign teacher. So far, he ______ in our school for five years.
A. was teaching B. has taught
C. will teach D. taught
To protect trees, we shouldn’t use paper towels ______napkins.
A. or B. and C. but D. with
I haven’t _______ my parents for a long time. I miss them very much.
A. hear of B. heard of
C. hear about D. heard from
You can save electricity by _______ the lights when you leave a room.
A. turn up B. turning on
C. turn off D. turning off
