He found it increasingly difficult to read，__________ his eyesight was beginning to fall.
| A．though |
| B．for |
| C．but |
| D．so |
You can only be sure of ________ you have at present; you cannot be sure of something ________ you might get in the future.
| A．that; what | B．what; / |
| C．which; that | D．/; that |
Could I speak to ________ is in charge of International Sales，please?
| A．anyone | B．someone |
| C．whoever | D．no matter who |
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 |