Directions: Select the alternative that best rephrases the given sentence.

When the engine was put right, the conductor pulled the bell.

When the engine was put right, the bell was pulled by the conductor.

The conductor put the engine right, and pulled the bell.

When the conductor put the engine right, the bell was pulled by him.

When the conductor had put the engine right, the bell was pulled by him.

When the engine had been put right, the bell was pulled by the conductor.