There are some police cars in front. What do you suppose ____?
| A．is the matter | B．is happened | C．is the wrong | D．the trouble is |
—Did Hans take part in the contest?
—No, at the last moment his courage _____ him and he ran away．
| A．ignored | B．declined | C．failed | D．lost |
As many as 100 species of fish, some ____ to these waters, may have been affected by the pollution．
| A．relevant | B．immune | C．unique | D．convenient |
— Have you seen ____ pencil? I left it here this morning．
—Is it _____black one? I think I saw it somewhere．
| A．a; the | B．the; the | C．the; a | D．a; a |
---Could I use your computer for a few minutes, please?
--- ________. I’m not using it myself.
| A．No way | B．It’s depends | C．Come on | D．Go ahead |
It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.
| A．when | B．that | C．before | D．after |