I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.

I’m really a bit worried because I have no idea what my parents’ _________ will be to my poor examination result．

My knowledge of Hong Kong came only from some movies: a______ of criminals are pursued by the police in the narrow streets and then they have a fight.

He is_____as a leader but he hasn’t _____in teaching.

The environment will ______ one’s character.