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
It was not until dark ______ he found ___ he thought was the correct way to solve the problem.
A. that; what B. that; that C. when; what D. when; that
Since the epidemic appeared last winter, it ______ about a hundred lives.
A. takes B. took C. has taken D. will take
China won Olympic gold in the women's short track 3,000 metres relay on Wednesday, with Canada ____ the silver．
A．picking up B．taking up C．looking up D．bringing up
_____ in the regulations that you should not tell other people the password of your e-mail account.
A. What is required B. What requires C. It is required D. It requires
The conference has been held to discuss the effects of tourism ______ the wildlife in the area.
A. to B. on C. at D. with
