根据句意，用括号里所给单词的适当形式填空。
He is friendly to his classmates, and has made many_______ (friend) here.
After two days off on weekends, we always feel very _______(relax).
—What about________ (have) a farewell (再见) party after the exam?
—Sounds great.
Rich or poor, young or old, we all have problems.  And unless we deal with them, we can ______ (easy) become unhappy.
—Excuse me. Where's Mr Wang?
—He _____ (play) football on the playground with his students.