Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
If you want to get the driver’s_______ you should take some courses first in the traffic school.
| A．license | B．certificate | C．passport | D．permission |
The police officers here do not usually_____ guns.
| A．bring | B．carry | C．take | D．hold |
Coffee is said to have_____ effects.
| A．promoting | B．stimulating | C．encouraging | D．enhancing |
Information technology is taught in most schools, ____ we have entered the information society.
| A．so | B．while | C．and | D．for |
____ you may be right, I can’t altogether agree.
| A．While | B．As | C．If | D．Since |