Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．to which | C．by which | D．from which |
stop fooling, boys and girls, and he .
| A．you | B．yours | C．yourself | D．yourselves |
.As is known to all,____ tiger is in____ danger of dying out.
| A．a; a | B．the; / | C．a; / | D．the; the |
.—Is there anyone who is gong the Great Wall?
_______
| A．None | B．No one | C．No | D．Not any |
British people always talk about wether.
| A．the; the | B．/ ,/ | C．/; the | D．the; / |
Cloning the sheep ----Dolly is a big in science.
| A．progress | B．run | C．jump | D．rush |