E-Bay，Amazon and Shopbop are popular websites __________ people can sell goods to each other．
| A．where | B．which | C．when | D．whose |
29.For English teachers ________ a more effective role in teaching, they must make every effort to raise students’ cross-cultural awareness.
| A．to play | B．playing | C．having played | D．Play |
28. —Did you hear Tom was criticized for his spelling mistakes in his English composition?
—Yes, but a more careful person ________ so many mistakes.
| A．wouldn’t make | B．needn’t have made |
| C．shouldn’t make | D．wouldn’t have made |
27.If you ________ to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.
| A．switch | B．appeal | C．submit | D．adapt |
26. —Are you going to further your studies after graduation?
—Well, I ________ yet. I might make some other choices.
| A．didn’t decide | B．haven’t decided | C．don’t decide | D．hadn’t decided |
25. —Some Chinese students find it difficult to understand native speakers when in London.
—Exactly, ________ they’ve learned a lot about grammar and known many words.
| A．if only | B．now that | C．as if | D．even if |