Verified answer

7 The cousins went to the Crimea for their holidays last summer.

8 They were playing tennis on the sports ground when the weather changed.

9 After I had finished my homework, I left the library.

10 Everybody was dancing in the hall when electricity suddenly went off.

11 By the time he found what he wanted he had spent all the money.

12 A fire broke out in a residence hall where the number of students were staying.