The population of Africa is __________ so rapidly as to cause great concern of the whole world.
| A．expanding | B．stretching | C．extending | D．spreading |
Happiness and success often come to those________are good at recognizing their own strengths.
| A．whom | B．who | C．what | D．which |
The book tells stories of the earthquake through the eyes of those ________ lives were affected.
| A．whose | B．that | C．who | D．which |
Many countries are now setting up national parks________animals and plants can be protected.
| A．when | B．which | C．whose | D．where |
Time is of no importance to great thoughts，________ are as fresh today as when they first passed through thinkers' minds ages ago.
| A．what | B．that | C．which | D．where |
Now there is just one point ________ I wish you to make quite clear.
| A．where | B．which | C．whether | D．when |