Question

You must be very （）when you cross the busy street. A)care 。B)careful 。B) carefully

Answer 1

b
考查形容词和副词的用法。句意“当你过马路时，你应该小心，并且要慢行。”be动词是系动词，后用形容词作表语，构成系表结构；walk是动词，副词修饰动词，故用carefully。故选b。