单词拼写（共5小题，每小题1分，满分5分）
根据下列句子中所给汉语注释，写出空缺处各单词的正确形式（每空只写一词）。
Look! Some birds are ______(飞) in the sky.
The three girls are my favorite ______(歌手)
When Li Lei was six years old, he taught _____(他自己) English.
Timmy’s parents are ______(严格的) with him.
Please do your homework more ______(仔细) next time.