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 .