1.most words have only one  pronunciation  but sometimes a word has two or more. PRONOUNCE 2.your general knowledge will be  enriched whenyou take past in the course. RICH 3.my grandfather was  extremely  knowledgeable about the history of China. EXTREME 4.if you weren't so  inactive , you wouldn't be so fat! ACT 5.each year many people  voluntarily  take care of the old and the disabled VOLUNTEER em ghi đáp án rồi ai có cách giải thích không ạ?