7 A: Where did you get these tasty sweets? B: They (sell) in most confectioners' around the city.

Explanation: The question is in the past simple, but the answer describes a general fact or a usual occurrence about where these sweets are sold. This calls for the present simple passive. The structure is 'am/is/are + past participle'. Since 'they' is plural, we use 'are'. The past participle of 'sell' is 'sold'.

Answer: They are sold in most confectioners' around the city.