21．The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
| A．set off | B．set down | C．set aside | D．set about |
There he pointed to _____ looked like a stone and said that’s ______ you had to carry home.
| A．that, that | B．what, what |
| C．which, what | D．as, which |
—I don’t like chicken _______ fish.
—I don’t like chicken, _______ I like fish very much.
| A．and, and | B．and, but |
| C．or, but | D．or, and |
Both teams were in hard training; _____ was willing to lose the game.
| A．either | B．neither |
| C．another | D．the other |
I’m sorry, _____ I won’t be able to come tonight.
| A．for | B．and |
| C．but | D．then |
Tom’s mother always told him not to smoke again, but _____ didn’t help.
| A．he | B．it |
| C．which | D．as |