根据句意和语境，用所给词的适当形式填空。

1．Ah．Hangzhou is a ______ (real)beautiful place．

2．He likes learning English by ______ (watch)TV．

3．Has everyone in your class ______ (write)a letter to the newspaper?

4．As an English learner，we should know the ______ (different)between

   British English and American English．

5．Are they ______ (friend) to you?