Dear John，
Thank you very much for your letter．I am glad that you enjoyed our holiday with me．We enjoyed having you and your sister here．We hope that you will both be able to come again next year．Perhaps you'll be able to stay longer next time．A week is not really long enough，is it？If your school has five weeks'holiday next year，perhaps you will be able to stay with us for two or three weeks．
We have been back at school three weeks now．It feels like three months!I expect that you are both working very hard now because you are in Grade Two now．Tom and Ann won't be in Grade Two until 2005．They went for a picnic yesterday but I didn't go with them，because I hurt my foot and I couldn't walk very well．They went to an island and enjoyed themselves there．
Tom，Ann and I send our best wishes to you．We hope to see you soon．
Yours，
Michael

根据上面信的内容，回答下列问题．


Who stayed with Michael for a holiday？ ______

How long did their holiday last for？ ______

From the sentence"It feels like three months!"，we know that Michael has no interest in learning，right？ ______

Who will be in Grade Two next year？ ______

Why didn't Michael go to the island for a picnic yesterday？ ______ ．