I feel that one of my main duties _____ a teacher is to help the students to become better learners.
| A．for | B．by | C．with | D．as |
. — Flight 551 for Dalas ______. I must be off now.
— Have a pleasant trip then.
| A．is being announced | B．has announced | C．was announcing | D．had been announced |
She broke away from the traditional ______ of wife and mother and became a journalist.
| A．way | B．custom | C．role | D．idea |
_____ we admit that there are still some problems about NMET, we don't mean that it is of no use.
| A．Until | B．While | C．As | D．Unless |
．—What would you like to do? Doing shopping or going to the cinema?
—_______．Whatever you want to do is fine with me．
| A．All right | B．It’s up to you | C．Glad to hear that | D．It just depends |
．Bay, Amazon and Wall Mart are popular websites ______ people can sell goods to each other．
| A．where | B．which | C．when | D．whose |