Ⅴ. 语法填空
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词，或使用括号内词语的正确形式填空。(最多限填三个单词)
Humans share Earth with a lot of wildlife and have lived in peace 1. them for thousands of years. 2. ，according to a study，the populations of animals 3. (include)birds and fish have fallen by an average of 60 percent 4. 1970. It seems as if there is now a 5. (six)mass extinction(大灭绝). By increasing human development，we may end up 6. (serious)harming the environment on which animals live and depend. For example，elephants 7. (catch)for their ivory，and Tibetan antelopes(藏羚羊)are killed for their 8. (value)fur. Luckily，many people have realized 9. some of us had done in fact do harm to animals，so people have quickly introduced ways to save both these endangered animals as well as 10. (we).

1. with
2. However
3. including
4. since
5. sixth
6. seriously
7. are caught
8. valuable
9. what
10. ourselves

1. “in peace with...” 为固定搭配，意为“与……和平共处”，所以填 with。
2. 前文说人类与野生动物和平共处，后文说动物数量下降，是转折关系，且有逗号隔开，所以用 However。
3. “animals” 和 “include” 之间是主动关系，这里用现在分词作后置定语，所以填 including。
4. “since + 时间点” 表示“自从……以来”，常与现在完成时连用，所以填 since。
5. 这里表示“第六次大灭绝”，用序数词 sixth。
6. 修饰动词 “harming” 要用副词形式，serious 的副词是 seriously。
7. “elephants” 和 “catch” 之间是被动关系，且表示经常发生的动作，用一般现在时的被动语态，主语是复数，所以填 are caught。
8. 修饰名词 “fur” 要用形容词，value 的形容词是 valuable。
9. “realized” 后接宾语从句，从句中 “done” 缺少宾语，所以用 what 引导。
10. “as well as” 连接两个并列成分，这里表示“拯救濒危动物和我们自己”，用反身代词 ourselves。