用方框中所给单词的适当形式填空。每词仅用一次，每空一词。
pride eat decide make east
已知向量a→=(2,1)，b→=(x,-2)若a→∥b→，则a→+b→=（ ）
Wang Feng is a ____. I like his songs very much.
圆锥的底面半径为8，母线长为9，则该圆锥的侧面积为（ ）．
