can you advise me any english poems, not difficult to understand, for a teenager?

and any other good books? he's reading only adapted english books, i want him to read originals. his level is intermediate-upper intermediate.

nowadays this is my first note there... it's sunny and warm in moscow today, so my mood is good too. although some days ago i felt bad - i can't get used to miss my ex-boyfriend. i hope he'll come back, because i feel i love him...we had some problems with different religions. but everything will be wonderful.