题目

用下列单词的适当形式补全句子。【1】He _____ (make) many cakes for his friend last week.【2】My sister wants _____ (be) a dancer.【3】I am not good at _____ (ski), but my brother does.【4】There aren’t _____ (some) _____ (balloon) in this room.【5】Su Hai, _____ ( not put) your hands on the desk. 答案：【答案】【1】made【2】to be【3】skiing【4】 any balloons 【5】don’t put【解析】【1】句意：他上周为他的朋友做了很多蛋糕。上周，用过去时态，make不规则变化，过去时态是made，故答案为made。【2】句意：我姐姐想要成为一个舞蹈家。Want to do sth想要做某事，故答案为to be。【3】句意：我不擅长滑雪，但是当a=112时，代数式2a2-1的值是 ．