– Have they found out the _____ of the fire?-- Yes. It was a cigarette end that _____ the fire.
35. Although this___________sound like a simple task, great care is needed.
34、It must have rained last night, ___________?
33. It is surprising that he_______have been such foolish, he never made such a mistake.
32. -Kate, what is wrong with your pen again? There is not enough time. -The ink_____come out.
31. They arrived at a farmhouse, in front of ___________sat a small boy.