We human beings should be very careful with what we do with nature, _____power is beyond our understanding.
Both of the two rulers are broken. I want to buy a _______ one.
December is the __________ month in year.
--- What is the date today?--- It's _________.
She knows a lot about China as she has been to China ________.
--- May I help you, sir?--- Yes, I bought the TV the day before yesterday, but it ______.