从下面方框中选择适当的词填入短文中，使短文通顺正确（注意有些词要用适当的形式）。方框中有两个多余的词。 elephantrainblack grow snow bebecome

阅读下面短文，根据短文内容，在短文后８１－８５小题中句子空白处填入适当的词语或句子。

Find the word in the passage which means “ the movement from one place to another of a large group of animals” and write it down here: __________.

The underlined word “ There” in the second paragraph refers to (指的是)____________.

The salmon comes back to its birthplace in order to ____________.

The lobsters begin to move to another place when _____________.