31.— Is Bob still performing? —I am afraid not. He is said _______ the stage already as he has become an official.
101. I’d appreciate ____ if you would like to teach me how to use the computer.
100.As the busiest woman in Norton,she made_________her duty to look after all the other people’s affairs in that town.
99.The chairman thought___________necessary to invite Professor Smith to speak at the meeting .
98.—There is still a copy of the book in the library. Wall you go and borrow ________? —No, I’d rather buy ________ in the bookstore.
97.The information on the Internet gets around much more rapidly than ____ in the newspaper.