Hey there!
The answer is es and están. It’s es because it is a characteristic. It’s son because it’s plural, and aburridos meanest it’s a characteristic. La película es muy aburrida y mis amigos están aburridos de verla.
I hope this helps!
1. C
2. D
3. B
4. D
only if it the letters can be repeated
the answer is les because it is saying to you that you don't want to cause anymore problems
