23.

18.He has made another wonderful discovery, ______ of great importance to science.

37.

35.

40.

52. According to the passage, money is “mysterious” because it _______.

34.

8. We ______ any attempts to infiltrate company networks to obtain user information.

13.She answered with a _____ “No” to the request that she attend the public hearing.

49. What step is essential to the traditional production of flu vaccine?

43.How many students can get A in college nowadays?

4.Unless we can draw out lessons for our own times, history becomes ______ a series of dry data points with no broader relevance.