根据短文内容，选择恰当的词填空。(每空一词)（10%）

Spring is the warmest and best            of the year. A lot of            come out. Some are red, some are             , some are whit, some are purple. Spring is the time to            trees. Look, many        are planting       on both sides of (两边)the          . How hard all these children are            ! They       making our city more and more             .