-- Sally, you must introduce your friend ___________ me.
-- OK, I will.
| A．for | B．to | C．at | D．in |
I won’t go to tomorrow’s party________I am invited．
A．if
B．unless
C．when
—________foggy day！
—Something must be done to solve the haze problem．
A．How
B．What
C．What a
If he________free tomorrow，he________to see me．
| A．will be；will come |
| B．has；comes |
| C．is；will come |
| D．is；comes |
The guide will collect your tickets as soon as you________the station．
| A．get to |
| B．gets to |
| C．will get to |
| D．got to |
—Are you going to Hainan for your holidays？
—No，________my parents pay for the trip．
| A．unless |
| B．if |
| C．because |
| D．when |