ProfessorTate__________abouthim.
流行性乙型脑炎的传染源是
Ithasbeenfoundthatastrong________helpovercometheeffectsofdistraction.
重写句子：Alanpassedthetest.Alanhadstudiedhard.Alanhadunderstoodthematerial.(complexsentence)
句子写作：Thepianoplayerbegantosingloudly.
Thedoctorsare________abouttheguidelinesunderwhichtheycancarryouteuthanasia.