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.

27. Hurry up! It's_____________(差不多) time for school.

26. The road is_________(全) covered with snow.

25. My parents bought three _________________ (空调机).

24. Birds fly in the _____________ (空中).