A. mystery B. incident

C. possibility D. evidence

31. We could have got there in time, but we were held up at the airport for two hours _____ the heavy fog.

A. due to B. along with

C. except for D. according to

32. The man said he had seen the Bigfoot twice in the forest, _____, of course, I doubted very much.

A. what B. which

C. when D. where

33. -Can you hear Linda _____ in the next room?

-Yes. She really sings beautifully!

A. to sing B. sings

C. singing D. sing

34. It is very hard to imagine _____ unless you have seen it with your own eyes.

A. what a big building is the Great Pyramid

B. how a big building is the Great Pyramid

C. what big a building the Great Pyramid is

D. how big a building the Great Pyramid is

35. The young man _____ from his position for making mistakes last month and he has been hunting for a job ever since.