I tried phoning her office, but I couldn't ().

单项选择题Thomas Jefferson and John Adams died on July 4, 1826, the fiftieth of American Independence ().

A．ceremony
B．anniversary
C．occasion
D．occurrence

单项选择题For a moment nothing happened. Then () all shouting together.

A．voices had come
B．came voices
C．voices would come
D．did voices come

单项选择题Almost all job applicants are determined to leave a good () on a potential employer.

A．illusion
B．impression
C．reflection
D．reputation

单项选择题In our class, when the bell rang and the teacher closed his book, it was a () for everyone to stand up.

A．signal
B．chance
C．mark
D．measure

单项选择题Would you please keep silent The weather report () and I want to listen.

A．is broadcast
B．is being broadcast
C．has been broadcast
D．had been broadcast

单项选择题He did not regret saying what he did but felt that he () it differently.

A．could express
B．would express
C．could have expressed
D．must have expressed

单项选择题—Do you want a lift home —It's very kind of you, but I have a much late in the office. I over slept this morning because my morning clock ().

A．doesn't go off
B．won't gone
C．wasn't going off
D．didn't go on