1、cando:takepicturesbecauseChinahavemanyamazinglybreathtakingsceneries.

　　myriaddeliciousfoods

　　gotohistoricalmuseumbecauseChinaisoneofthefouroldestcountries.

　　cannotdo:somethingswhichviolatelawsandharmforthesociety.

　　smokinginthepublicplacesandmakenoiseinhere.

　　2Personally,I'mforextensivetravelandIdothinkstudentsshouldtravelduringtheirholidaysiftheydon'thaveanythingmoreimportanttodo.

　　Theadvantagesofextensivetravelvarydenpendingondifferentpeople.Forme,itgivesmeanopportunitytodiscoveraworldpartlyortotallydifferentfromwhatiamaccustomedto.Igettomeetdifferentpeople,knowdifferentculturesandofcourse,seedifferentsceneries.Thisexperiencebroadensmymindandenablesmetorealize,thisworldissobigandfullofvarieties.Eachofthesevarietiesneedsmyunderstandinganddeservesmyrespect.Thisisoneofthewaysayoungpersonlearnshowtobepatientandtolerant.

　　Thedisadvantagesofextensivetravel,frommyviewpoint,isthatit'senergyandmoneyconsuming.Ineedagoodrestafteranextensivetravel.It'snotaspeopleoftenthinkagoodrestfromworkorstudy.OnelastpointIwouldmakeis,extensivetravelisnotsuitableforanystudent.Somestudentslacktheabilitytofeelordiscovertheabundantnessofanotherculturethusextensivetravelendstobeawasteofmoneyandtime.

　　3.mankindshouldobservelawswhichrelatetogeneticengineering

　　donotintendtionallydisturbnature.