3、-Mustweleavenow?-No,we___.weleavenow?-No,we___.westillhavetwomorehours.
a.can‘t.b.mustn't.c.needn't.d.shouldn't4.Tom___comewithustogether,butheisnotverysureyet.A.must.b.may.c.can.d.should5、yourfriend___moreifhewantstobethinner.a.needsexerciseb.needsexercisingc.needexercisingd.needstoexercise