根据所给单词首字母及汉语意思，填入单词，使句子合理、通顺。
(1)I always p      （种）trees with my family in spring?
(2)He always help people ，he is ______.(有帮助的)
(3)In summer, the w      （天气） is usually very h    .（热的）
(4)Our math teacher is very y______.(年轻的) He’s very f______.（有趣的）