They have been skating______ 2 hours ago.
A. for B. until
C. since D. after
----Why don’t you go to the movie with me?-----Because I _______it already.
A. saw B. have seen
C. see D. seen
____ useful the computer is!
A. What a B. What an
C. How D. How a
Do you remember what ____ at 11:00a.m yesterday?
A. were you doing B. you were doing
C. are you doing D. you are doing
When Tom got to my house, my family ___ dinner.
A. were having B. was having
C. is having D. are having
If you don't go, I _______, ______.
A. do, too B. don’t, either
C. don’t, too D. won’t , either
