You ought to help each other in your studies, ________ you?

A. should　　　 B. shouldn’t

C. ought　　　　 D. mustn’t

My demand （要求）is that the information referred to in my report _____to Mr. Brown without delay.

A. to be e-mailed B. e-mailed　 C. be e-mailed D. being e-mailed

---how about ____ christmas evening party?

　 --- I should say it was ___ success.

A. a;a B. the ; a C. a; / D. the; /

A telephone is an instrument by which we can speak to people far away. The underlined word means ____.

A. a tool　 B. an experiment　 C. an expression　 D. an instruction

—Must I turn off the gas after cooking ?

　 —Of course . You can never be　　　　 careful with that .

　 A．enough B．too C．so D．very

Papermaking began in China and from here it _____ to North Africa and Europe.

 A.spread              B. grew                 C. carried                    D. developed

It was only after some progress ____ in the use and development of electricity that men began to realize the importance and possibilities of magnetism.

A、was made　 B、would have been made C、has been made D、had been made