Which “ai” in the following word has a different pronunciation from the others?
| A．afraid | B．said | C．paid | D．explain |
—It’s time to go to bed，Li Ming．
—Mum，I have a lot of homework to do and I won’t go to bed________I finish it．
| A．after |
| B．until |
| C．as soon as |
| D．since |
There was an important meeting last night．Mr.Smith________to it．
| A．was invited |
| B．invited |
| C．is invited |
| D．invites |
—Your city looks beautiful！
—Yes．Lots of trees and grass________last year．
| A．are planted |
| B．have planted |
| C．were planting |
| D．were planted |
Who were the shoes with special heels invented________？
| A．with |
| B．of |
| C．for |
| D．by |
—A number of students________in the dining hall．
—Let me count．The number of the students________about 400．
A．are；is
B．is；are
C．are；are