题目

词汇；请根据句意或括号中的中文提示、英文释义，写出句中所缺单词，使句子通顺。 1. We had a long ________________ (讨论) about the plan. 2. As a student, you should learn how to face ________________ (各种各样的) difficulties. 3. Our parents have taught us not to do something                    （违反）the law since we were children . 4. We ______________ (比较) the two watches carefully, but found nothing different. 5. --- How many ________________ (行星) are there in the solar system?    -- Eight. And Earth is one of 用所给词的正确形式填空 An oil leak in the sea caused concerns over ________ pollution. (environment)