1.You’d better be s______,we’re not joking.

You'd better be s____ ;we're not joking.（翻译） We’re in class.You’d better not_______ you do not underest ,you must be joking you must (be joking) You must be joking It's better to be alone than to be with someone you're not h you'd better-----(not be)crazy about it You'd better ____(try)____(not be) late again. you'd better ___（eat）more meat because you're heavy.是填 not e You'd better careless next time A.not to be B.not be C.be no you must be joking,救命 句:You must (be joking).