根据句意写出画线单词的反义词。
1.Mike is tall, but his brother is _________.
2.My pen is long, buy Lily’s pen is _________.
3.He can’t fly, but he _________ run.
4.I have two pencils. One is _________, but the other is short.
5.My mother is thin, but my father is _________.
6.My eyes are big, but my ears are _________.