Now waste from daily life in the city of Shanghai to be separated into four different groups．（ ）
A．is requiringB．is required
C．was requiredD．required
Talk to your teacher and you will get help ________ you have a problem.
| A．unless | B．if | C．until | D．so |
They got up early_____ they could catch the early bus.
| A．that | B．in order to |
| C．so that | D．to |
—Will you come to the dinner party?
— I won’t come unless Jenny____.
| A．will be invited | B．can be invited |
| C．invited | D．is invited |
—Peter, do you know if David _________us in the fashion show this Sunday?
—I’m sure if he _________his homework, he will join us.
| A．joins; finishes | B．will join; finishes |
| C．joins; will finish | D．will join; will finish |
（2014）—Why didn’t you go to school yesterday?
—______ my mother was in hospital and I had to take care of her.
A. Then B. Because C. If