9. Tom and Mary (not/have) lunch at the moment.

1. Вспомним структуру Present Continuous: to be + Ving (глагол с окончанием -ing).

2. Для подлежащего Tom and Mary используем форму to be: are.

3. Добавим not и окончание -ing к глаголу have: not having / aren't having.

4. Получим предложение: Tom and Mary aren't having lunch at the moment.

Ответ: Tom and Mary aren't having lunch at the moment.