As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.
| A．exposure | B．distribution | C．expansion | D．emission |
Please remain _______; the winner of the prize will be announced soon.
| A．seating | B．seated | C．to seat | D．to be seated |
When we arrived in the deep night, we found there was no food _______ as all the shops were shut.
| A．left | B．available | C．remaining | D．convenient |
- Did you remember to give Mary the money you owed to her?
- Yes, I gave it to her_ ____I saw her.
| A．while | B．uddenly | C．the moment | D．once |
- The water was left running all night long.
- Yes. It seemed that John ___. He was the last one to leave the lab.
| A．was to be blamed | B．was to blame |
| C． had been blamed | D． should be blamed |
Only after a baby seal is pushed into the sea by its mother _______to swim.
| A． how will it learn | B．will it learn how |
| C． it will learn how | D．and it learns how |