Определить сколько кокса потребуется чтобы нагреть 1,5т железного лома от 39С до плавления,если К.П.Д. 60%?

Помогите пожалуйста!!!!

Употребить в правильной форме Present Perfect, Present Continuos, Present Simple, Past Simple 

1.You (to remember) me ? We (to meet) here this month. 

2. They already (to discuss)  this question? - Yes, they ( to discuss) it last week. 

3. Where mother (to put) my magazine? I (to look) for it now.

4. Whom you (to wait)  for ? - We ( to wait) for the doctor. 

The doctor ( to go) out some minutes ago. 

5. I (not yo have) any news from them since they ( to leave )Kyiv. 

6. Your children already (to read) this text? - Yes, they ( ot read) it at the last lesson. 

7. There (to be) nobody here now. All the students ( to go) home. 

8. It (to be) dark in the street now. the sun already ( to sit) 

9. When  you( to hear) the news? - I (to hear) them last Saturday.

10. What you (to do) now? - I (to write) a letter to my friend. - When you( to receive) his letter? - I (to receive )it today. 

11. Your son already ( to do) his lessons ?- Yes, he just ( to finish) doing them and now he ( to watch) TV.

12. It (to rain )now? -  No, it ( ot stop) rainig an hour ago and now the sun ( to shine )

13. She ( to learn) the new words and now she  (to translate) the text. 

14.  Your child already  (to get)  a passport ?-Yes, he (to get) it two days ago. 

15. It (to be )time to go. You ( to finish) your work? 

Решите пожалусто!!!срочно!

Оксид железе(2)->Хлорид железа (2)->нитрат железа(2)->гидроксид железа->сульфат железа(2)

на одного ребёнка резус-отрицательного и с группой крови 0 претендует две родительские пары: а/мать резус-отрицательная с группой крови 0,отец резус-положительной с группой крови AB .Какой родительской паре принадлежит ребёнок?