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.