—I want to be a scientist to do some research on green cars when I grow up.—Work hard. I’m sure your dream will be ______.
I am sure that you’ll ______ the difficulty.
They have been skating______ 2 hours ago.
----Why don’t you go to the movie with me?-----Because I _______it already.
____ useful the computer is!
Do you remember what ____ at 11:00a.m yesterday?