очень надо 4 и 7 поставьте общ/альт/раз/спец во с Did очень надо ​

4. Did my colleague take business letters and translate them into Russian?

Did my colleague translate letters into Russian or Ukrainian?

Did my colleague take business letters and translate them into Russian, didn't he/her?

What language did my colleague translate business letters?

7. Did my friend buy a new mobile telephone at the shopping last week?

Did my friend buy a new mobile telephone or a new MP3 player?

Did my friend buy a new mobile telephone at the shopping last week, didn't he/she?

What did my friend buy at the shopping last week?