21. He missed the plane ______ driving very fast to the airport.
A. despite B. unless C. if D. without
22. After the fire, very little of the house ________ standing.
A. left B. remained C. rested D. held
23. I’m sure your suggestion will ____ the problem.
A. contribute to solve B. be contributed to solve
C. contribute to solving D. be contributed to solving
