用所给单词的适当形式填空。
①There was an____ (argue) happened between Tom and Jack last night.
②Lucy never ____ (have) a walk after supper every day.
③The people in Iraq keep fighting for their own ____ (free).
④The teenagers have to work hard because of the____ (press) from their parents.
⑤They tried their best to find the____ (solve) because they want to solve the problems.
表示氢原子，
表示氧原子）