________ energy is generated from natural resources—such as sunlight, wind, rain, tides and so on.
| A．Recyclable | B．Non-renewable |
| C．Rechargeable | D．Renewable |
His proposal is so idealistic that there are many______difficulties in putting it into practice.
| A．familiar | B．relative | C．practical | D．terrible |
As nobody here knows what is wrong with the machine, we ________send for an engineer to handle the problem.
| A．should | B．must | C．can | D．would |
The Spring Festival, a traditional Chinese festival, is celebrated in________Asian countries.
| A．many other | B．any other | C．other many | D．other any |
Can you think of some cases ______-people are likely to tell lies?
| A．that | B．as | C．where | D．when |
—Shall we go out for a walk?
—Sorry. I’m too busy to ______-for the moment.
| A．get away | B．get off | C．get through | D．get together |