---Why not open the windows to let _____cool air in?
---I’d rather you didn’t. ________air in out town is terribly polluted.
A. a; The B. /; The C. / ;/ D. the; /
----Are my clothes too casual?
----No. You can go ____you are.
A. as B. what C. that D. where
How ___ I help them to understand when they won’t listen to me?
A．can B．would C．may D．must
In summer, food will go bad if________in room temperature.
A．leaving B．left C．being left D．having left
QQ, you can chat with your friends, makes communication easy.
A．why B．which C．that D．where
Mike must be angry with me, for he walked me without even saying hello.
A．past B．on C．at D．over
