Zhang Hong is said by heart 2000 words up to now .
The traditional view is ________ we sleep because our brain is “programmed” to make us do so.
The new technology will make ________possible to grow food with very little water.
________ matters most in learning English is enough practice.
Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
I'd like to start my own business–that's ________ I'd do if I had the money.(2011·陕西)