Rick has learned a lot about Chinese culture he came to China.
| A．before | B．when | C．until | D．since |
All of us must do_______ to help protect the environment，or we will have more hazy weather雾霾天气.
| A．something useful | B．anything useful | C．useful something | D．useful nothing |
I don’t like bread. I won’t eat it_____________ I am much too hungry.
| A．if | B．when | C．because | D．unless |
---Dad, must we wait until the light becomes green?
---Yes,I’m afraid we.That’s the traffic rule.
| A．can | B．may | C．have to | D．need |
You don’t know how difficult the job is,you have done it yourself.
| A．unless | B．since | C．if | D．because |
---Excuse me. I’m looking for Be the Best of Yourself.
---Sorry. The book you ask forout.
| A．is selling | B．is sold | C．was selling | D．will be sold |