By the end of the next month, we________what we are required to learn.
| A．have learned |
| B．learned |
| C．had learned |
| D．will have learned |
The traditional view is ________ we sleep because our brain is “programmed” to make us do so.
| A．when | B．why | C．whether | D．that |
The new technology will make ________possible to grow food with very little water.
| A．it | B．it is |
| C．that | D．that is |
________ matters most in learning English is enough practice.
| A．What | B．Why | C．Where | D．Which |
Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
| A．what | B．that | C．which | D．why |
I'd like to start my own business–that's ________ I'd do if I had the money.(2011·陕西)
| A．why | B．when | C．which | D．what |