6. The ( ) person is liable to succeed in the challenge.
A. social
B. gracious
C. friendly
D. sociable
7. The police showed responsibility ( ) the preservation of public order and security.
A. forB. to
C. inD. on
8. He doesn't feel ( ) when he is left ( ).
A. alone…alone
B. lonely…lonely
C. alone…lonely
D. lonely…alone
9. Take a hat with you ( ) the sun is very hot.
A. in case
B. though
C. for fear
D. in that case
10. A ( ) of the camel is its ability to live for a long time without water.
A. quality
B. feature
C. characteristic
D. character
6. D7. A8. D9. A10. C