The workers insist that the company should take         measures to improve their working condition.

During enjoying the Mid-Autumn Festival, celebrating the harvest is an important reason, but of __________ importance is the whole family’s get-together.

—If not controlled, some terrible diseases will spread in the stricken areas after the terrible earthquake.—So people there are in _____ need of medical teams.

Speaking of all the songs he has written, I think this is probably his ________ one. 

By popular consensus, great painters can mix the colours together within a short period of time to get the __________colour.