There ________ many people ________ in the office, but now nobody is allowed to．

A．used to be; smoking

B．used to have; smoking

C．used to be; smoke

D．used to have; smoke

Water ________ electricity widely all over the world．

A．is used to produce

B．is used to producing

C．used to produce

D．used to producing

It is ________ that all celebrities in the entertainment circle pay their taxes to the government．

A．commanded

B．requested

C．advised

D．required

The newly-founded chess club formally ________ us to attend the opening ceremony．

A．requested

B．required

C．demanded

D．commanded

Is this a ________ flight, or do we stop off anywhere?

A．continuous

B．continual

C．continue

D．lasting

Taking this kind of medicine, if ________, will possibly do him great harm．

A．to continue

B．continued

C．continues

D．continuing

I’m glad that my parents have ________ of me buying a new car．

A．agreed

B．promised

C．allowed

D．approved

By no means ________ promised to keep you ________ of how their business was going on．

A．he has; informing

B．he has; informed

C．has he; informing

D．has he; informed

－Where can I get ________ information about a long journey?

－Nothing is of ________ than a map, I think．

A．an; greater help

B．a piece of; greater price

C．some; better useful

D．some; greater value

________, I cannot accept your invitation．Hopefully, we’ll get together some time next year．

A．To my regret

B．To regret

C．Regretted

D．For my regret