Although _____ my opinion, the old professor didn’t come up with his own
| A．against | B．on | C．for | D．in |
_____ New York _______ London are two of the largest cities in the world.
| A．Either; or | B．Both; and |
| C．Neither; nor | D．Not only; but also |
John was so sleepy that he could hardly keep his eyes ______.
| A．open | B．to be opened | C．to open | D．opening |
— Has Jack finished his homework yet?
— I have no idea；he ＿＿it this morning.
| A．was doing | B．had been doing | C．has done | D．did |
______ leaves the room last ought to make sure that the windows are closed and the door locked.
| A．Whoever | B．Who | C．Who will | D．Those who |
We should think of ways to stop the waste from the factory _____ our living environment.
| A．being polluted | B．polluting | C．from being polluted | D．polluted |