1.Yes, David is in the chess club. или Yes, it is.
2.Yes, Martina is interested in ecologe. или Yes, she is.
3.No, David and Martina are not in the karate club. или No, they are not
4No, Emma is not in the chess club. или No, she is not.
5. Yes, Emma and Martina arethirteen years old. или Yes, they are