—Yes, it's difficult _________ interesting.

Tom: I like to have this class best because I like playing basketball and soccer very much. It can also help us keep healthy.

Sally: In the class, I can learn to play many kinds of instruments (乐器). I can also learn to sing many new songs.

Bob: I love this class best because the language (语言) is becoming more and more important in the world. In this class, I can also see many interesting movies.

Ted: Many girls think it is hard to learn it well, but I like it best. It is difficult sometimes, but it is interesting.

—Because the color makes him happy.