Complete each of the following sentences with a (compound) word derived from the one(s) given in brackets.
The number of tigers in nature has greatly decreased. The （ ）of wild tigers has become a serious problem. ( survive )
【正确答案】：SURVIVAL
【题目解析】：
自然界中老虎的数量大大减少了。野生老虎的生存已经成为一个严重的问题。survival生存。
