Not until ________ in the college entrance exam ________ that he had wasted much time using his mobile phone to surf the Internet and play games.

s that noise–Oh, I forgot to tell you. The new machine______.

The twins, who ______ their homework, were allowed to play badminton outside.

China Daily is _________ a newspaper It helps greatly to improve our English

下列各句中没有语病，句意明确的一项是