Maria has to baby-sit．That’s＿＿＿ she can’t come out with us．
| A．why | B．how | C．when | D．what |
37. There are many harbors on the east ____ of our land.
| A．bank | B．coast | C．beach | D．Seashore |
38. Donkeys and camels are still widely used in some parts of the world _____ of burden.
| A．for animals | B．as animals | C．as beasts | D．instead of beats |
39. As you make your ____, so you must lie on it. (prov.)
| A．clothes | B．bed | C．house | D．Bike |
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 _____.
| A．time | B．the time | C．the times | D．Times |