根据短文内容，按要求答题。Iftheteacherasksaquestionyouareexpectedtogiveananswer．Ifyoudonotunderstandthequestionyoushouldputupyourhandandasktheteachertorepeatthequestion．Ifyoud

　　根据短文内容，按要求答题。

　　Iftheteacherasksaquestionyouareexpectedtogiveananswer．Ifyoudonotunderstandthequestionyoushouldputupyourhandandasktheteachertorepeatthequestion．Ifyoudonotknowtheansweritisallrighttotelltheteacherthatyoudonotknow．Thenheorsheknowswhatyouneedtolearn．

　　Thereisnoexcusefornotdoingyourhomework．Ifyouareabsent(缺席)，youshouldcallyourteacherorsomeonewhoisinyouclassandaskfortheassignment(作业)．Itisyourresponsibility(责任)tofindoutwhatassignmentsyouhavemissed．Itisnottheteacher'sresponsibilitytoremindyouofmissedassignments．

　　Youmustnotbeabsentonatestday．Ifyouareseriouslyillcallandlettheteacherknowyouwillnotbethereforthetest．Ifyourteacherallowsmake-uptestsyoushouldtakethetestwithinoneortwodaysafterreturningtoclass．Seriousillnessistheonlyreasonformissingatest．

　　Beontime!Itisconsidered(认为)rudetobelate．Alsoitdisturbsotherstudents．Ifyoumustcomeinlatebesuretodoitquietly．Haveyourbooksandpapersoutofyourbagbeforeyoucomeintotheroom．Thengotoyourseatandsitquietly．IntheU．S．itisnotnecessarytoknockbeforeyouentertheclassroom．Ifyoumustleaveduringclassdosoquietly．Thereisnoneedtoasktheteacher'spermission．Enteringateacher'sofficeoranyofficewithacloseddoorwithoutknockingfirstisnotacceptable．Knockfirstthenwaittobeinvitedin．

　　Wearingahatinclassisconsideredimpolitebymanyteachers．Someteachersmayignoreitbutyoushouldaskpermissionfirst．

　　1．Whatshouldastudentdoifheorshedoesn'tunderstandtheteacher'squestion?

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　　2．Ifastudentmissesaclasshowcanheorshefindouttheassignment?

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　　3．Whatistheonlyreasonformissingatest?

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　　4．Isitnecessaryforastudenttoknockbeforeheorsheenterstheclassroom?

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　　5．Putthesentence“Wearingahatinclassisconsideredimpolitebymanyteachers．”intoChinese．

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