We should keep trying, and I think our efforts will finally _____.
| A．pay out | B．pay back | C．pay for | D．pay off |
Recently people have made great progress in using ____ power of nature to produce____ electricity.
| A．a; the | B．/; / | C．the; / | D．a; an |
By 16:30, ______was almost closing time, nearly all the paintings had been sold.
| A．which | B．when | C．what | D．that |
We look forward to the day when the motorcar has been replaced by some less dangerous ______of transport.
| A．means | B．methods | C．manners | D．ways |
It took him a long time to ______the skills he needed to become a professional artist.
| A．acquire | B．inquire | C．require | D．request |
I’m so glad you’ve come here to ______this matter in person.
| A．lead to | B．see to | C．turn to | D．refer to |