It sounds like a good idea, but it _________ to be seen whether it will succeed.
Take a taxi,___________ you'll miss your train.
________ is quite natural,a beginner can't read the books written in English very quickly.
—Do you regret paying 500 dollars for your necklace? --No, I would gladly pay__________ for it.
__________ it rain, the crops_____________.
--You forgot your keys when you left home in the morning. --Good heavens,___________.