Multi-choice problem: Continue writing the next sentence in this paragraph:

How to complain about secondhand smoke in apartments
Have friendly conversations with all of your neighbors.
Not only can talking to your neighbors help you figure out where the smoke is coming from, but you also may find out that you're not the only person having trouble with secondhand smoke in your apartment.
Begin by asking the person if they smoke.

pick from the following.
1). Then ask if you can come in and talk to him about what you're feeling. You want to be as open and honest with him as possible, so communicate your concerns using two forms of communication-by phone or email.
2). If they say they don't, you might say " have you noticed any secondhand smoke coming into your apartment lately? I've been having a problem with that. " if they do smoke, ask if they smoke in their apartment.
3). Not only will it help you understand how to deal with a smokers' problem, but it will also be a good show of the respect which you've shown your neighbors. Everyone who smokes is its own person.
4). You can say, " hi! Has anyone ever complained about secondhand smoke in my home? " if the person says yes, they probably smoke. It's more likely that you'll find out from a close friend or family member.
2).