这两个句子中的that都可以省略,也可以带着.因为that studying English is important and interesting和 that math is interesting and improtant都是作think的宾语,他们都是宾语从句.在动词后的宾语从句中that都可以省略.如果句中还有多个宾语从句,只有第一个that可以省略.例如：The teacher said(that) the text was very important and that we should learn it by heart.