37. The forest is full of wild _______________(动物).

36. I came home late and my mother was _____________(生气).

35. She read for an hour ____________(然后) went to bed.

34. They live _______________(在…之中) the mountains.

33. Can you lend me 2,000 ______________ __________ (美元)?

32. The United States of A_____________ is a big country.

31. ________________(虽然) they are poor the children are happy.

30. She had _____________(已经) gone when I arrived.

29. We went for a walk ___________(沿着) the river.

28. The old lady was ____________ (独自) in the house.