B）根据句子意思，用括号中所给单词的适当形式填空。
小题1:My family live on the ▲ (five) floor of the tall building.
小题2:— Why do you say Sandy does her homework ▲ (careful)?
— Because she always makes many mistakes in her homework.
小题3:Yesterday I ▲ （buy）a new dress at the Macy’s for my mum.
小题4:Today most students can go to high school for further ▲ (educate) in our country.
小题5:You needn’t be frightened because these insects are completely ▲ (harm).
小题1:fifth
小题2:carelessly
小题3:bought
小题4:education
小题5:harmless
小题1:考查序数词。five的序数词形式是fifth。故填fifth。
小题2:考查副词的用法。修饰动词does用副词，根据makes many mistakes可知，是粗心地。carelessly“粗心地”。故填carelessly。
小题3:考查时态。根据yesterday可知，应该用一般过去时。buy的过去式是bought。故填bought。
小题4:考查固定短语。further education“继续教育，进修”。故填education。
小题5:考查形容词。harmful“有害的”，反义词是harmless。根据“这些昆虫完全无害”可知，应该用harmless。故填harmless。