—How much shall I pay for the telephone call?
—You _____. It's free.
A．mustn't
B．shouldn't
C．don't have to
D．can't
—Why did you plant so many trees?
— ______ the environment.
A．Improve
B．To Improve
C．Improved
D．Improving
—Can we finish the work with ______ money and ______ people?
—I'm afraid it's impossible.
A．less; fewer
B．few; less
C．less; less
D．fewer; fewer
—Computer is so useful. It can do almost everything.
—Yes, but it ______ what to do.
A．will tell
B．has known
C．must be told
D．is told
That building is now a supermarket. It ______ a cinema.
A．was
B．is used to be
C．used to be
D．would be
I don't usually like staying at ______ hotels, but last summer we spent a few days at ______ very nice hotel by the sea.
A．the; a
B．the; the
C．/; the
D．/; a
