1. corren (ellos form)
2. abre (Ud. form)
I'm not sure what the question is here but the first one is correct.
Están haciendo un viaje de dos semanas
Costa rica protects 23% of it's total territory in national parks.
Answer:
the verb would be "<em><u>V</u></em><em><u>E</u></em><em><u>N</u></em><em><u>I</u></em><em><u>R</u></em><em><u>"</u></em><em><u> </u></em>