Here are the best answers for the given sentences:

1. **B. look around** - We can look around the bustling market and try different street food.
2. **A. hand in** - The street vendors hand in delicious bowls of pho to hungry customers all day long.
3. **C. come across** - After exploring the Ben Thanh Market, we decided to come across for some coffee later.
4. **D. come upon** - If you’re interested in attending a local festival, you can come upon the dates and locations online.
5. **C. run into** - A drop by Volunteers from the university to run into the elderly in our community.
6. **B. check out** - A run out of cultural events to check out to help people from different backgrounds.
7. **D. break up with** - Many families are breaking up with using plastic bags and switching to reusable shopping bags.
8. **C. throwing away** - Last Sunday, our family cut down on throwing away food.
9. **B. went out** - I went out to the market to try some street food.
10. **C. deal with** - My grandmother’s famous recipe for pho has been passed down through generations in our family.
11. **C. deal with** - The villagers are working hard to deal with the challenges of exporting their handcrafted products overseas.

Feel free to ask if you need further assistance!