Answer:
I stop, make sure the car is locked and then go to the front door.
Or I stop, open the door, and say hello to the front secretary.
Explanation:
I'm not exactly sure what you're asking but by the patters of the first sentences, I think the ones I put are right.
Answer: A. están.
Las tiendas están cerca del mercado.
The shops are close to the market.
Explanation: In Spanish, the verb "estar" is used to indicate the location of something. Since the subject in this sentence is "tiendas", that is a third-persona in the plural, the verb must be conjugated in this form. Las tiendas están.