B）根据句子意思，用括号中所给单词的适当形式填空。
My family live on the    ▲   (five) floor of the tall building.
— Why do you say Sandy does her homework    ▲   (careful)?
— Because she always makes many mistakes in her homework.
Yesterday I    ▲   （buy）a new dress at the Macy’s for my mum.
Today most students can go to high school for further    ▲   (educate) in our country.
You needn’t be frightened because these insects are completely    ▲   (harm).