Ⅰ. 单句填空
1.The young lady behaved bravely （brave） in the face of danger.
2. To gain （gain） complete mastery of English, one must study very hard.
3.He is very optimistic about his chance of passing the exam.
4.My mother asked me to behave myself （me） before the guests.
5.He has said he will cooperate fully with the police.
