Two motorcycle mechanics were arrested for their alleged involvement in innumerable vehicle thefts.

A. The police has arrested two motorcycle mechanics for their alleged involvement in innumerable vehicle thefts.
B. The police arrested two motorcycle mechanics for their alleged involvement in innumerable vehicle thefts.
C. For their alleged involvement in innumerable vehicle thefts, police had arrested two motorcycle mechanics.
D. For their alleged involvement in innumerable vehicle thefts, two motor cycle mechanics have been arrested.
✅ The correct answer is option B.

The teacher punished the boys who had not done their homework.

A. The boys who had not done their homework had been punished by their teacher.
B. The boys were punished by their teacher who had not done their homework.
C. The boys who had not done their homework were punished by the teacher.
D. The boys who had not done their homework were being punished by the teacher.
✅ The correct answer is option C.

It was imagined by some of them that they would inevitably run out of cash.

A. Some of them imagined that they would inevitably run out of cash.
B. They imagined that they would inevitably run out of cash.
C. They imagined that they would not have an immense supply of cash with them.
D. They imagined that they would run out of cash.
✅ The correct answer is option A.

Boil the water and cool it before you keep it in the fridge.

A. Let the water be boiled and cooled before it is kept in the fridge.
B. Let the water be boiled and cooled before it is kept in the fridge by you.
C. Let the water be boiled by you and cooled by you before it is kept in the fridge.
D. Let the water be boiled, cooled and kept in the fridge.
✅ The correct answer is option A.