1 Make the sentences interrogative.
1) The enemy had destroyed the toví before 1942.
2) They had gone for a walk before they finished working.
?
3) The travellers lost their way because they had left the map in the camp.
4) She called them back after she had arrived.
2
5) The show had begun before they entered the hall.
6) The group had become popular by the end of the 21st century.
?
7) The writer had finished the book before the war broke out.
?
8) We had found the information by the end of the week.
?
9) Thad left school before it was repaired.
10) The tourists had reached the camp before the thunderstorm began.

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