20、Having waited for the scientist for nearly an hour, they      that he could not arrive on time.

A．have informed        B．informed          C．were informed         D．are informed

19、As is known to all, the man who      last night       charged with murder.

A．was arrested; has been                                 B．arrested; was

C．had been arrested; had been charged             D．has arrested; was

18、It was not until I watched the TV program     I knew     special the Sundance Film Festival was.

A．how; that        B．that; what          C．that; how              D．when; how

17、Sometimes we can kill two birds with one stone.      , we can complete two goals with only one effort or action.

A．For example          B．That is         C．By the way         D．In addition

16、Very wonderful changes in matter       we pay little attention take place before our eyes every day.

A．at which        B．for what        C．to which          D．to that

15、The theme of the play is the American dream, which is based on the idea that       can anybody become successful and lead a happy life.

A．only through hard work                               B．with hard work

C．by working hard                                         D．to work hard

14、Today’s homework was easy       , so Mike finished it quickly and went out to play.

A．to be done        B．done         C．doing          D．to do

13、Women born in the 1970s were      to follow in their dads’ footsteps.

A．more three times likely                                 B．three more times likely

C．three times more likely                                D．likely three times more

12、Something in my voice must have made him feel safe,        ?

A．mustn’t it        B．hasn’t it           C．must it          D．has it

11、When I opened the box, I saw a large diamond       like a rose, and a pure white light seemed to come from deep inside the diamond.

A．shaped           B．shape           C．shaping          D．to shape