英语填空用SUCHASMedicalsciencehasmademanyadvances,yettherearestillseriousdiseasesthathavenotbeenconquered,____________.Suchinventions__________havecontributedgreatlytotheprogreeofcivilization.However,otherinventions,____

　　英语填空用SUCHAS

　　Medicalsciencehasmademanyadvances,yettherearestillseriousdiseasesthathavenotbeenconquered,____________.

　　Suchinventions__________havecontributedgreatlytotheprogreeofcivilization.However,otherinventions,_________,havethreatenedhumanexistence.

　　Therearecertaintimeswheniwishtobealone,_________when__________orwhen____________.

　　Somesubjectshavealwaysbeeneasyandenjoyableforme,________.However,othersubjects,____________,__________.