根据句意或首字母填空，每空一词。

1. My friend likes sports,  so she is very a_______.

2.  Her father is more s_______ than her mother.  He hardly ever laughs.

3.  Jane isn't very o_______, she likes to stay at home and do some reading.

4.  Mary and Kate are t_______, so they look like the s_______.

5.  It is n_______for us to go over our lessons carefully before the exam.