Though plastic bags really bring convenience to us，they also ________ many problems for the environment.
| A．lead to |
| B．refer to |
| C．contribute to |
| D．appeal to |
Mr. Johnson always carries a notebook, in which he ________ everything that happens.
| A．sets down | B．settles down |
| C．comes down | D．breaks down |
— Have you finished your experiment report, Jane?
— Oh, my God. I've ________ forgotten all about that.
| A．strongly | B．extremely | C．entirely | D．freely |
The children of the farmer prefer _________ in bigger cities to _______ in their hometown.
| A．stay ; settle | B．stay ; settling |
| C．staying ; settle | D．staying ; settling |
He seemed to have ________from the terrible experience, and looked happier.
| A．recovered | B．covered | C．suffered | D．come |
—Help! Help! Police ...
—________, Madam. What's the trouble?
| A．Be quiet | B．Calm down |
| C．Shut your mouth | D．So rude |