A survey suggests that the royal wedding of Prince William and Kate Middleton _____ a great boost for British economy because a large number of visitors are expected to go.
Wind power is an ancient source of energy we may return in the near future.
It was not until dark ______ he found ___ he thought was the correct way to solve the problem.
Since the epidemic appeared last winter, it ______ about a hundred lives.
China won Olympic gold in the women's short track 3,000 metres relay on Wednesday, with Canada ____ the silver.
_____ in the regulations that you should not tell other people the password of your e-mail account.