求大神做几道英语完成句子

网友回答

can't be cleaned
keeping healthy
twice the size of
known for
the second longest river
prevent it from getting colder
======以下答案可供参考======
供参考答案1:
5 the second longest river
6 in case the Weather get cold
4 more knowed for
供参考答案2:
好难得说，，请教其他大神吧，给跪了