We have to finish our homework first,________?
| A．haven’t we | B．don’t we | C．mustn’t we | D．shouldn’t we |
—What have you learned from your experience in Thailand?
—Well, meeting people from another culture ______ be very difficult．
| A．must | B．can | C．should | D．shall |
All her hard work ______ in the end, and she finally passed the exam．
| A．paid back | B．paid off | C．brought out | D．brought off |
—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 |