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