28. My English teacher has given me so much help that I really want to do something for him ______.
38. Donkeys and camels are still widely used in some parts of the world _____ of burden.
39. As you make your ____, so you must lie on it. (prov.)
40. --- What did you have for supper, Jack?--- I had some _____.cow B. ox C. bull D. Beef
41. If you don’t advance, you would be behind _____.
42. Which of the following groups is meat? _____