What are they talking about? They are talking about ______.

W. What do you find hardest in English?
M: I find listening really hard. Sometimes it’s just impossible to understand.
W. Well, you just need lots of practice. The more you listen to English, the easier it becomes.
M: It’s easier said than done!
W: Why don’t you buy a radio? Then you can listen to Radio Beijing or BBC English programs on the radio.
M. Do you think that would help?
W. Of course. And why not buy some English tapes and some books to go with them? I’m sure you’ 11 find them useful.
M: Yes, that’s a good idea. But I still have another difficulty. My written English isn’t very good, either.
W: Oh! Welt, for that, you’d better find an English pen friend.
M: Thank you for your advice.