( )1.—how much shall i pay for the phone call?
—you________. this is free of charge.
a.shouldn’t b.can’t
c.don’t have to d.mustn’t
( )2.—may i leave the office before 5 o’clock in the afternoon?
—no, i’m afraid you ________.
a.needn’t b. wouldn’t
c.mustn’t d.won’t
( )3.the outbreak of flu last year tells us that a sound public health system ________ be built up and strengthened in our country.
a.should b.can
c.will d.may
( )4.—shall i tell john about it?
—no, you ________. he is very busy recently.
a.needn’t b. wouldn’t
c.musn’t d.shouldn’t
( )5.often when i passed the village, i________ them working on the farm.
a.will see b.would see
c.must have seen d.usually saw
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