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