Ответ:

1. Why don't we go and watch...?

2.How about watching a comedy?

3. Let's meet outside the cinema.

2.1. Let's make something to eat

2. How about ordering pizza?

3. Why don't we order from...?

Объяснение:

Let's + глагол без to и без окончаний.

How about + глагол с окончанием - ing.

Why don't + подлежащее + глагол- сказуемое без to и без оконч.