________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
| A．Recyclable | B．Non-renewable |
| C．Rechargeable | D．Renewable |
In order to make students have a good knowledge of science subjects, they are encouraged to______ their own science experiments.
| A．operate | B．direct | C．manage | D．conduct |
No one knew where my grandfather was, and many came to _____us in searching for him.
| A．help | B．assist | C．provide | D．encourage |
—Is the People’ Great Hall _______to ordinary visitors?
—Of course.
| A．accessible | B．available | C．reasonable | D．adjustable |
What a sunny weather today! Let's hope it_______ for Saturday's tennis match.
| A．keep up | B．stay up | C．go up | D．hold up |
Because of the heavy foggy weather, we had to _______ the plan of going to Xi’an for the football game by air.
| A．conceal | B．delay | C．abandon | D．prevent |