My friend Sally is really _____. She likes to take part in different activities after school.
四个选项的含义分别是：quiet 安静的；kind 友好的；active 活跃的；clever 聪明的。根据题干中的“她喜欢在放学后参加不同的活动”可推断，她很活跃，故答案为 C。
She didn't throw away the old car because it was still in good _____.
本题考查名词的词义理解。四个选项的含义分别是：competition 竞赛；condition 状况；invention 发明；communication 交流。根据题干中的“她不把旧汽车丢弃”可推断，它的“状况”仍然很好，故答案为 B。
—Would you like to go shopping with me?
—I'm afraid I'm _____ tired _____ go.
本题考查 too…to…的结构。句意：——你想和我一起去购物吗？——我恐怕太累以至于不能去了。too…to do sth. 意为“太……也至于不能做某事”，故答案为 B。