Пожалуйста, помогите решить. Выберите нужную форму вспомогательного глагола из…

1. The price isn’t high2. We don’t usually quote a high price3. How much are their goods4. How much do we pay for their goods? 5. I don’t often stay at work after 8 p.m.6. I am not often at work after 8 p.m.7. He doesn't usually have talks at 4 p.m.8. He isn't usually at talks at 4 p.m.9.Who does she send e-mails to? 10. Who are these e-mails for?