19. Only when your identity has been checked ____.

36. What does the underlined word “these” in Paragraph 2 refer to?

48.The exhibition is sponsored by   48   organizations.

50.The organizing committee of the exhibition is   50  .

43. Choose the right time order of the following events.a. The first Father’s Day was observed.b. Mother’s Day was proclaimed a day for national observance.c. Father’s Day became a day for national observance.d. The idea of honoring fathers was brought up.

( ) 15. The richer countries always raise the prices of their imports.

45. The author’s purpose of writing this passage is to ____.

27. I devote my whole day to ____ the English grammar.

37. Why is space junk considered a problem?

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

62. 你是在什么时候意识到英语非常值得学习的？

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