Thedoctorsare________abouttheguidelinesunderwhichtheycancarryouteuthanasia.
TheaveragelifeexpectancyoftheRedIndiansis________.
英语翻译：weaponsofmassdestruction
Veryfewpeopleunderstoodthiscontract,______wasveryobscure.
CharlesSmith,______wasmyformerteacher,retiredlastyear.
