( )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 sars 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?
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