AIDS control and prevention is a to China as well as the whole world．
| A．surprise | B．challenge | C．reaction | D．threat |
By talking with them，I get to know ________ Russian people see their country and the US.
| A．what | B．when | C．why | D．how |
According to Aristotle，we are ________ we repeatedly do.Excellence then，is not an act，but a habit.
| A．which | B．when | C．where | D．what |
After months of a frustrating voyage on the rough sea，they eventually came to ________ they called their “dream land”．
| A．where | B．what | C．how | D．which |
Honesty is a basic element in friendsmaking and that is ________ it requires to keep everlasting friendship.
| A．how | B．which | C．whether | D．what |
When she first arrived in China，she wondered what the future might have ________ for her，but now all her worries are gone.
| A．in need | B．in time |
| C．in preparation | D．in store |