38. The man or woman left behind usually (______).

2. Sue is very ________ of hiking and backpacking.

1. As we can’t all agree __________ which song we should sing， let’s vote on it.

40. The subject matter of this selection is _____.

39. A son is unwilling to work in his father’s business mainly because _____.

38. Based on the passage， it can be assumed that ______.

37. Most young adults in the U.S. get married for the sake of ____.

36. The writer discusses the marriage of young adults in order to show which of the following?

35.What is the main idea of this passage?

34.According to the researchers， what is the reason for some people with autism to have difficulty in non-verbal social interactions?

33.The findings of Emily Willingham＇s study show that ______.