I soon found that the work I was doing had already been done by someone else，____, I was wasting my time.  

A．to make things worse   B．in other words     C．a(chǎn)t the same time      D．for another thing

--____ you go so soon?

--Yes, I ______.  

A．Can; must            B. Must; must                 C. Have to; needn’t     D. Must; have

The books in the largest library of the city could _____ all the information we need.

A．offer                       B．supply               C．provide              D．present

The actress has to ___a diet to lose weight because she is to act a pretty slim girl in a film.  

 A．take on              B．carry on                 C．go on               D．have on  

The actress has to ___a diet to lose weight because she is to act a pretty slim girl in a film.  

A．take on                    B．carry on              C．go on               D．have on  

I lived with my sister this summer and didn’t have to pay rent. So I _____ save most of my salary.

   A. was able to       B. would           C. could             D. should

I promised to get there before 5 o’clock, but now the traffic is still so heavy. They _____ for me impatiently.

   A. may wait       B. must be waiting    C. could wait        D. ought to wait

 I ______ her, but I never could.

   A. ought to help     B. must help       C. must have helped    D. ought to have helped

The Smiths went to the country for the weekend as they ______ to the office.

   A. needn’t have gone   B. mustn’t go    C. may not go        D. didn’t have to go

 My parents never remember my telephone number, and they always ______ look it up.

   A. should           B. can           C. have to            D. must