We believe scientists will ________a way to solve the problem of air pollution.
| A．set off | B．put off | C．come up with | D．catch up with |
Dr. Black comes from either Oxford or Cambridge. I can’t remember _____.
| A．who | B．there | C．which | D．what |
I’ve put a cross on the map to show _____ that famous hotel is.
| A．where | B．wherever | C．what | D．whatever |
— Lucy is not coming tonight.
— But she _____!
| A．promised | B．will promise | C．had promised | D．promises |
— You’ve left the light on.
— Oh, so I have. _____ and turn it off.
| A．I go | B．I’ve gone | C．I’ll go | D．I’m going |
He is a deep thinker _____ opinions are worth much.
| A．who | B．whose | C．that | D．which |