根据句意，用所给单词的适当形式填空。
Today we had an English test. We have a __________(month) test on each subject.
I don’t want to do any _________(mean) things like these.
_________(luck), he fell off the bike and hurt himself badly.
---Do you know the _______(high) of the tree?  --It  is 4 metres high.
He finishes the ________(little) homework of us three.