Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．When |
7. —I’m going to visit China next month.
—_____I wish I could go with you.
| A．Congratulations! | B．Sorry, I can’t go. | C．Oh, how soon? | D．Good for you! |
6. I didn’t expect you to come so soon. How long did the journey_______?
| A．go | B．cover | C．make | D．Take |
5.Whenever he was asked why he was late for class, he would answer carefully, always______the same thing.
6.
| A．saying | B．said | C．to say | D．having said |
4. —What do you think of a bus tour in London?
—I think it would be great fun , but make sure you have a copy of the city’s travel____with you .
| A．check | B．direction | C．file | D．brochure |
3. _______flying is more expensive than land and sea travel, I went there by air to save time.
| A．If | B．As | C．Even though | D．In case |