1.They wish they _________(can live) under the sea.

问题描述:

1.They wish they _________(can live) under the sea.

could live,wish后面跟虚拟语气,谓语动词要用过去时

could live
表示希望,要用虚拟语气

they wish they could live under the sea.
wish在这里算是虚拟语气的用法,所以,时态要变过去式.