which sentence begins with a dependent clause?

responses:

the children decided to play soccer in the park near their house

when we go to lunch in the morning we need to take our lunches and our backpacks

my friends and i are going camping today, and tommorow my cousin is going to join us

my dad is looking for his shoes while our dog is burying them in the garden

When we go to lunch in the morning we need to take our lunches and our backpacks.