11. He was born ______ a teacher’s family.

　　A. in

　　B. off

　　C. at

　　D. of

　　12. Distance can help us rediscover ourselves, ______ we are able to meet each other in a new way.

　　A. that

　　B. so as to

　　C. so that

　　D. in order that

　　13. He ______ gardening and planted a lot of beautiful rose trees in his retirement.

　　A. took over

　　B. took out

　　C. took on

　　D. took to

　　14. A few minutes after the plane had taken off, it developed engine trouble and ______.

　　A. crashed

　　B. dashed

　　C. stopped

　　D. blushed

　　15. The conference ______ three days by the time it ends.

　　A. must have lasted

　　B. will have lasted

　　C. would last

　　D. has lasted