1. Rats leave (or desert or forsake) a sinking ship. 

2. Stink the rats out by burning sulphur.

3. The farmer poisoned the rats.

4. The prison is infested with rats.

5. The rats was gnawing at the box.

6. The stores were overrun with rats and mice.

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7. Rats had burrowed into the bank of the river.

8. The back yard was infested by rats.

9. The researchers are repeating the experiment on rats.

10. The rats have eaten holes in those bags of flour.

11. Flies, lice, rats, foxes and cockroaches can all be described as vermin.

12. Rats have gnawed a hole.

13. The ship abounds with rats.

14. A huge effort was made to exterminate the rats.

15. Rats! I forgot to buy any bread.

16. The rats were controlled by poisoning.

17. This was demonstrated in a laboratory experiment with rats.

18. He wrote his Master's dissertation on rats.

19. The apartments were infested with rats and roaches.

20. The rats have chewed away some of the woodwork.

21. The rats have chewed away some of the furniture.

22. The barn was infested with rats.

23. The period of gestation of rats is 21 days.

24. The city is suffering a plague of rats.

25. Rats and flies spread germs.

26. The rats gnawed away some of her furniture.

27. I think rats and snakes are repulsive.

28. The rats have eaten away most of the woodwork.

29. In biology classes at school we used to dissect rats.

30. The city is under threat from a plague of rats.