21. I can _____ some noise while I’m studying, but I can’t stand loud noises.

A. come up with

B. catch up with

C. put up with

D. keep up with

22. I cannot give you _____ for the type of car you sell because there is no demand for it in the market.

A. an expense

B. a charge

C. a purchase

D. an order

23. I didn’t quite _____ to what you had said. Would you mind repeating it?

A. catch on

B. get hold

C. catch up

D. go on

24. I didn’t say anything like that at all. You are purposely _____ my idea to prove your point.

A. revising

B. contradicting

C. distorting

D. distracting

25. I felt somewhat disappointed and was about to leave, _____ something occurred which attracted my attention.

A. unless

B. until

C. when

D. while