When doing my homework,________.
A.I heard the doorbell ring B.the doorbell rang
C.my mother came in D.my mother was cooking
We have been looking at houses, but haven’t found _____ we like yet.
A. ones B. one C. them D. it
Please remember to _____ a stamp _____ your envelope before you post it to your friend.
A. attach; to B. fasten; to
C. tie; to D. stick; by
When I was younger, I’d often go for _____ drive with some friends, purely for _____ enjoyment of it.
A.a; an B. a; the C. the; / D. /; the
The airport ___next year will help promote tourism in this area.
A. being completed B. to be completed
C. completed D. having been completed
Nowadays people are more concerned about the environment ___ they live.
A. what B. which C. when D. where
