---Who do you think should ____ the responsibility for white pollution?
--- Both the producer and the consumer.
| A．burden | B．replay | C．answer | D．undertake |
—I don’t know why Tom was absent from yesterday’s meeting.
—He must have been sick, _______？
| A．isn’t he | B．didn’t he | C．wasn’t he | D．mustn’t he |
When I first lived abroad, I had to do the housework for others____a week’s accommodation.
| A．in exchange for | B．with regard to | C．by means of | D．in place of |
—I didn’t know you were a very good cook. Who taught you?
—Here’s a tip If_______rom my mother.
| A．took up | B．picked up | C．learned about | D．read about |
Why not try your luck in big cities, Bob? They’re_______the best jobs are.
| A．what | B．which | C．where | D．that |
.It’s the first time this term we_______an examination after class in the afternoon.
| A．didn’t have | B．don’t have | C．hadn’t had | D．haven’t had |