Answers:-
1.For half an hour the AC was making a strange sound.
2.The company was making an over bridge since 2007.
3.For many centuries, Indians were practising Sati practice.
4.Since last week, the newspaper was publishing the news.
5.Oil prices, for the last week, were going up.
please check this carefully.
- The AC had been making a strange noise for half an hour.
- The company had been making an over bridge since 2007.
- Indian had been practising Sati practise for many centuries.
- The newspaper had been publishing the news since last Monday.
- Oil price had been going up for the last week.