. After the terrorist attack last month, anyone at the airport heavy bags, bottles of liquid, or whatever, could be stopped and questioned by the police.
| A．seen carrying | B．seen carry |
| C．seen to carry | D．seen to be carrying |
Great attention must be paid __________ welfare, especially in the poor area.
| A．develop | B．to develop |
| C．to developing | D．developing |
—When did you last hear __________ Jay?
—He phoned me this morning, and we agreed __________ a time and place to meet.
| A．of; to | B．about; with |
| C．from; with | D．from; on |
The reason why he was late for school this morning is __________ his bike broke down on his way to school.
| A．that | B．because |
| C．since | D．as |
I didn't want to go with him, so I invented a (n) __________ about things I had to do on Friday.
| A．excuse | B．reason |
| C．cause | D．explanation |
"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.
| A．to; of | B．on; off |
| C．in; on | D．on; of |