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 fifth ▲ (five) floor of the tall building.
【小题2】— Why do you say Sandy does her homework carelessly ▲ (careful)?
— Because she always makes many mistakes in her homework.
【小题3】Yesterday I bought ▲ （buy）a new dress at the Macy’s for my mum.
【小题4】Today most students can go to high school for further education ▲ (educate) in our country.
【小题5】You needn’t be frightened because these insects are pletely harmless ▲ (harm).
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解析：
【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。