选择性必修四Unit 4 Sharing单元测试 第一节、阅读下列句子，在空白处填入1个适当的单词或括号内单词的正确形式。 1．However, for those of you with a positive mind, opportunity lies __________ each challenge. 2．When you rise to the challenges, you will have the opportunity __________ (acquire) great...