38. Countries want future space tools to be able to fall back into the earth’s atmosphere so that ____.

33. He glanced at the envelope and ____ his uncle‘s handwriting.

30. ____ time and labor, cartoonists generally draw the hands of their characters with only 3 fingers and a thumb.

39. How do the Germans plan to deal with space junk?

10.

9.

42. From the passage, we know in the U.S. ____.

( ) 14. Usually the poor countries decide the prices of natural resources.

50.The organizing committee of the exhibition is   50  .

20. The new stadium being built for the next Paralympic Games will be ____ the one that has been destroyed.

（  ）54. It’s impossible for us to avoid the economic crisis, so we have to learn to live through it.

31. Along with the letter was his promise ____ he would visit me this coming Christmas.