It's.Not difficult ________[learn]a foreign language._______[communicate ]is more than just speaking.Tony always give people a_______[cheer ]greeting.Mom told me to wash the clothes ______[separately].Though some cartoons were made many years ago ,they still _____[show ]on tv now.If we continue ______[damage ]the earth ,the environment will become even worse.用所给词的适当形式填空.