About 60 percent of the students __________from the south; the rest of them __________from the north and foreign countries.
| A．are; is | B．is; is | C．is; are | D．are; are |
What some people don't realize is ________ difficult life can be after they get addicted to drugs.
| A．that | B．how |
| C．why | D．what |
Don't put off till tomorrow ________ you should do today!
| A．what | B．when |
| C．that | D．which |
—Don't you believe me?
—________， I'll believe ________ you say.
| A．No; whatever | B．Yes; no matter what |
| C．No; no matter what | D．Yes; whatever |
The reform has changed the whole nation. It cannot remain ________ it used to be.
| A．what | B．where |
| C．which | D．when |
Evidence has been piled up ________ drinking water after getting up in the morning contributes to one's health.
| A．what | B．which |
| C．if | D．that |