The company sells products. Products ____ by the company.

This is an exercise in converting active voice to passive voice.

The original active sentence is: 'The company sells products.'

To form the passive voice:

• The object of the active sentence ('products') becomes the subject of the passive sentence.
• The verb 'sells' (present simple) changes to the present simple passive form: 'is/are + past participle'.
• Since 'products' is plural, we use 'are'. The past participle of 'sell' is 'sold'.
• The subject of the active sentence ('the company') becomes the object of the preposition 'by' in the passive sentence.

Therefore, the passive sentence is: 'Products are sold by the company.'

The missing verb is 'are sold'.

Ответ: are sold