The snails are going to leave their old house and move to a new ___.
问题描述：
The snails are going to leave their old house and move to a new ___.
答
The snails are going to leave their old house and move to a new _home__.
答
填代词one, one 代指 a new house。
答
be abou to do sth.= be going to do sth.马上着手做某事.are about to start是即将开始,句中有soon,表示在不久的将来,所以选A.
答
填代词one。