18.Once,an old and eccentric(古怪的) scientist decided to use the cloning procedure(56)to make (make) a clone of his boss's dog.He was working on the(57)assumption (assume) that if he produced a clone of the dog,his boss would approve his promotion.The man stirred his mixture(58)which∕that contained the dog's hair.(59)If his colleagues heard about his efforts they would be bound to stop him.They could never resist an opportunity of saying that he was too old to work in a cloning laboratory.True he did make mistakes from time to time,but only last week he succeeded in(60)restoring (restore) a dead mouse to life as a clone.So,why not clone a dog?As he was thinking,the mixture thickened.He stared(61)impatiently (impatient) at it,waiting for the shape of the animal that would shortly emerge.Gradually the cells began to form.(62)A creature began to grow and develop(63)claws (claw) and feathers!The scientist screamed and(64)fled (flee) from the room as any possibility of promotion disappeared in that instant.He had not brought back a dog(65)but produced a monster!