() 15. The roof fell down he had time to dash into the house to save his baby.

   A. as   B. after   C. until   D. before

() 14. Tom,keep away from the fire, you will get burnt.

   A. and   B. so   C. or   D. but

() 13. Nancy looked around, she didn't see anybody.

   A. and   B. so

   C. but   D. because

() 12. Work hard, you may catch up with your classmates soon.

   A. or   B. but   C. and   D. yet

() 11. I want to know it will rain tomorrow.

   A. that   B. which   C. what   D. if

() 10. Mr. Li Mr. Gao watched the World Cup,but I didn't.

   A. Either;or   B. Neither;nor

   G. Not only;but also   D. Either;nor

() 9. Edison never gave up he failed many times.

   A. and   B. though   C. or   D. hut

() 8. Though it was cold, he went out with- out a coat.

   A. but   B. when   C. because   D. /

() 7. Luckily,all the students got out of the teaching building it fell down.

   A. until   B. before   C. since   D. while

() 6. Tom didn't have dinner he finished watching the cartoon.

   A. while   B. unless   C. until   D. since