C
Being hard-working is of the highest __________ to becoming successful.
| A．important | B．to be important |
| C．importance | D．being importance |
Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.
| A．achieved | B．has achieved |
| C．will achieve | D．had achieved |
—What's the party like?
—Wonderful.It's years________I enjoyed myself so much.
| A．after | B．when | C．before | D．since |
________a certain doubt among the people as to the practical value of the project.
| A．It has | B．They have |
| C．It remains | D．There remains |
We ________ contact with each other for years. And last week we ________ contact again.
| A．lost; made | B．have been out of; got into |
| C．had been out of; made | D．came; kept |
The hotel wanted to charge $150 for the room service, but we couldn't ____________ to live in such an expensive hotel.
| A．pay | B．afford | C．charge | D．pay for |