Mo Yan's winning of 2012 Nobel Prize shows the world's________of China" contemporary literature.

---Don't be so naughty! Be your ________.---Got it. 

For the young, ______ should be showed to their parents, teachers and old people.

Burning all the lights in the classroom will be a great______ on electric power.

It is widely accepted that animals learn to do things because their certain acts lead to _______.