21. Outside my office window there is a fire ____ on the right.
A. escape B. ladder C. steps D. stairs
22. I ____with the Browns during my stay in New York City.
A. put in B. put down C. put on D. put up
23. Operations which left patients ____ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.
A. exhausted B. unhealthy C. upset D. fearful
24. Farmers are allowed to grow small gardens of their own and they sell their vegetables ____ the black market.
A. on B. at C. in D. for
25. The electric fan does not work because of the ____of service.
A. pause B. break C. interruption D. breakdown