помогите плиз)))пожалуйста)))))))))))))))))))

спасибо)

1) The scientist has already written his article.2) They discussed their problems last night.3) Mike has just visited his grandmother.4) The boys found a ball yesterday.5) Andrew's hamster hasn't eaten his food yet.6) The opera singer changed her dress during the last break.7) I have just read this modern magazine.8) Ann saw this fantastic film last Monday.9) Have you ever visited London Tower?