Should I look up the new words each time I come across some—No, refer to your dictionary only ______.

Many facts proved that long before Columbus ________ America, Chinese had visited it

下列关于课文内容的表述和课文内容的理解，不正确的一项是

My uncle’s house in the downtown area is much smaller than ours , but it is twice____ expensive .

It was foolish of him to _____ his notes during that important test, and as a result, he got punished. [ ]