Составьте предложения, используя слова:1. have to / their products / charge

Составьте предложения, используя слова:
1. have to / their products / charge / businesses / the market price / for.
2. is relevant / of / services / and / the law / to all goods / demand /
3. are bought / together / that / often / and / products / consumed/ /are / complements
4. in demand / result / of / the decrease / will / in / a market price / decrease
Помогите пожалуйста.