He made another wonderful discovery, _____ of great importance to science.
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |
In April, thousands of holidaymakers remained________ abroad due to the volcanic ash cloud.
| A．sticking | B．to be stuck | C．stuck | D．to have stuck |
—How did you like Nick’s performance last night?
—To be honest, his singing didn’t ________to me much.
| A．appeal | B．belong | C．refer | D．occur |
Mark________have hurried. After driving at top speed, he arrived half an hour early.
| A．needn’t | B．wouldn’t | C．mustn’t | D．couldn’t |
After graduating from college, I took some time off to go travelling, ________turned out to be a wise decision.
| A．that | B．when | C．where | D．which |
I’m going to see what Dad is________. Two hours is a long time to take over a coffee.
| A．up | B．up to | C．up against | D．up with |