Scientists said the smaller the airborne particles, the more ______ they are to cause illness.
| A．possible | B．likely |
| C．probable | D．perhaps |
He may win the competition，________he is likely to get into the national team.
| A．in which case | B．in that case |
| C．in what case | D．in whose case |
The president of the World Bank says he has a passion for China，________he remembers starting as early as his childhood.
| A．where | B．which | C．what | D．when |
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 |