— What should we do to prevent the flu?
—We should keep our rooms_____ and the air fresh all the time.
A. cleaning B. cleaned C. clean
Well, I have ________to tell you. Please keep quiet.
| A．important something | B．anything important |
| C．something important | D．important something |
Eating a ________diet helps us to keep a _________of yin and yang.
| A．balanced; balance | B．balance; balance |
| C．balancing; balancing | D．balance; balanced |
This school is different ________ others. It has many out-of-class activities.
| A．Off | B．from | C．of | D．for |
Thanks for________ me to go to your English party.
| A．invite | B．to invite | C．invites | D．inviting |
—Tom, you look tired this morning. What’s wrong?
—I was so busy that I didn’t go to bed________12 o’clock last night.
| A．until | B．when | C．though | D．unless |