35. we were swimming in the lake ____ suddenly the storm started.

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

34. We should bring ____ to his attention that we are too busy now.

A. this　　　　　 B. that　　　　　　 C. what　　　　　 D. it

33. _____ all the inventions have in common is _____ they have succeeded.

A. What; what　　　 B. That; that　　　 C. What; that　　　 D. That ; what

32. It was in the small house _____ he was born _____ he ended his life.

A. that ; where　　 B. which; that　　　 C. where ; that　　 D. that ; which

31. I can hardly imagine Peter ____ across the Atlantic Ocean in five days.

A. sail　　　 　　B. to sail　　　　　 C. sailing　　　　 D. to have sail