We recently did a simple experiment, which happens to ________ how children's knowledge of what a hero is like determines their behaviour.

 I hope I will not be called on in class as I’m not yet ____ prepared.

The manager promised to keep us _____ of how our business was going on. 

The president spoke at the business meeting for nearly an hour without _________ his notes.

-Can you help me with the maths homework, mom?-You can't always ________others' help for your homework.Do it by yourself this time, dear.