What might a couple do in a canoe? Choose the most suitable option to answer the above question. Options：  A. marry each other  B. make sex  C. communicate  D. fishing  E. row about
E

Where could you find 10 or 100 home that are not attached together? Choose the most suitable option to answer the above question. Options：  A. denver  B. neighborhood  C. city or town  D. michigan  E. apartment building
B

Where should a ventilation system be closed? Choose the most suitable option to answer the above question. Options：  A. house  B. office building  C. in the attic  D. hospital  E. large building
D