“Alice gave her teachers some flowers this morning” is _________.
I'm afraid I have to go now, for my parents_______ outside.
Smoking is not allowed in our school, so it may be a good chance for our math teacher to_______ smoking.
She looked at the professor and wondered where she_______ him.
- How often do you play basketball? -_______. I am too busy to relax myself.
It worries our government a lot that the air in our city is _______than it used to be.