1. finish off
Everyone except the boy wanted to finish the rabbit off.
2. be up to
The boy was up to his homework the whole afternoon.
summary:
Weasley's family is not rich, so it's a problem for Mrs. Weasley to prepare for the new term supplies of them. Ron's eldest brother, Percy, carried the letter from Hermione to Ron and Harry. She really cared about Harry's situation and wanted to meet them as soon as possible.