根据句意及首字母提示填空。

1. —Why does your brother like P.E.? —Because it's r______.

2. I am t______ after long hours' work in the fields (田野).

3. Jim likes science and math because he thinks they're very i______.

4. Wenchuan Earthquake took place on May t______, 2008.

5. Tom doesn't  l______ any subjects and he is the last one in his class.

小明本学期数学平时作业、期中考试、期末考试的成绩分别是90分、86分、95分，各项占学期成绩分别为30%、30%、40%，小明本学期的数学学期成绩是（    ）分。