Ⅱ.用方框中所给单词的适当形式填空（每词仅用一次，每空一词）

【小题1】It is ________to have a good diet to stay healthy.
【小题2】David bought his father a __________ on Father's Day.
【小题3】Jiaxing is _________the most beautiful cities in Zhejiang Province.
【小题4】The book，New Exploring，is ________written for young students.
【小题5】Scientists are working to ________a better way to fight air pollution.