In winter,most of the rivers and lakes there are__.It becomes a world of ice.(freeze)

题目

In winter,most of the rivers and lakes there are__.It becomes a world of ice.(freeze)

答案

In winter,most of the rivers and lakes there are_frozen_.It becomes a world of ice.
冬天,那里大部分的湖泊河流都结冰了,成为了冰雪的世界.
结冰：be frozen