最好帮忙解答下为什么这样选``1.Planting a tree is_______.Trees help control pollution.A fun B a fun C great funs2.My mother's birthday is ________ of August.A at the seventh B in the seventh C on the seventh

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最好帮忙解答下为什么这样选``
1.Planting a tree is_______.Trees help control pollution.
A fun B a fun C great funs
2.My mother's birthday is ________ of August.
A at the seventh B in the seventh C on the seventh

A be+adj,植树很有趣
C 在某天用on