Выполнить упражнение номер 1,заранее спасибо!

1. Who are you waiting for?-I'm waiting for my friend.-Have you been waiting for him for a long time?-Yes, I have been waing for an hour already.-Do you wait for him here often?-Yes, I do.
2. What are you translating?- I’m translating an article. – How long have you been translating?- I’ve been translating it for two hours already. I translate three articles a week.
3. Don’t enter the class-room. The students are taking exams there. They have been taking their exam since 9 a.m. The students take 4-5 exams every term.
4. Don’ go outside, it’s raining. It’s been raining since early morning. It’s raining very often in autumn in Moscow.
5. Can I see Nikolay?- No, he is dining. Wait a little bit.- Has he been dining for a long time already?- Yes, he has been dining for an hour already. He always dines at this time.