An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
| A．that | B．where | C．who | D．what |
Only at that time ______ that he had made a lot of mistakes in his homework.
| A．He realized | B．did he realize |
| C．he did realized | D．realized he |
He ______ prison two years ago and now he _______.
| A．was put in; was set free | B．was shut into, is set free |
| C．put into, has been set freely | D．was put into; has been set free |
If city noises _______ from increasing, people _______ shout to be heard even at the dinner table 20 years from now.
| A．are not kept; will have to | B．are not kept; have to |
| C．do not kept; will have to | D．do not kept; have to |
I _____ ten minutes to decide whether I should reject the offer.
| A．gave | B．was given | C．was giving | D．had given |
The people are ______ young workers between the age of twenty and thirty.
| A．nearly | B．almost | C．mostly | D．most |