题目

短文填空，请用适当的词完成这篇短文，每个空只能填写一个形式正确、意义相符的单词。                       Our class organised a special activity on 5 March, Learn From Lei Feng Day. On the afternoon of 4 March, we had a class meeting to discuss (1)                  we would do. After a long discussion, we finally decided to go to the local old people’s home to (2)                   services for the elderly. On the (3)                  of 5 March, we set out very early. As (4) 若函数在区间内有极值，则实数的取值范围是               .