I think Tom, as the head of a big department, should either study regularly or______ his job.
| A．quits | B．to quit | C．quitting | D．quit |
.
---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 |