用所给词的适当形式填空。 1. This is an ______ (interest) place. Many people like it. 2. I don't think English is as ______ (difficult) as maths. 3. Can you hear the sound of children ______ (play) outside? 4.The people in the ship were enjoying ______ (them). 5. The ______ (thank) mother didn't know what to say.