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21. _________ good, cookies made by the Smiths sell well in the market.
A. Smelling B. Being smelled C. Smelled D. To smell
22. While watching TV, _________.
A. the doorbell rang B. the door bell rings
C. we heard the doorbell ring D. we heard the doorbell rings
21. _________ good, cookies made by the Smiths sell well in the market.
A. Smelling B. Being smelled C. Smelled D. To smell
22. While watching TV, _________.
A. the doorbell rang B. the door bell rings
C. we heard the doorbell ring D. we heard the doorbell rings

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