1. It is known that China is one of the great ancient __________ (文明) in the world.
2. Professor James will give us a _________ (讲座) on the Western culture tomorrow.
3. This business company was ________ (创建) in 1724.
4. We must know that an active volcano may _______ (喷发) at any time.
5. Something must be done to stop the factory from _______ (倒出) waste water into the river.
