37. He asked the waiter()the bill.

51、Of all the students in our class, Betty writes ___________.

50、You _____do that, if you don＇t want to.

49、What will be the population of our country by the end of __________.

48、How many students ________in your class?

47、He plays bowling much ____________than he did three years ago.

46、I＇ll have a cup of coffee and _____.

45、My father is leaving ______Shanghai tomorrow.

44、One and a half hour _______since we arrive. No one has come to meet us.

43、We＇ll go for a picnic if it ________tomorrow.

42、Do you regret paying five hundred dollars for the painting?
No, I＇d gladly have paid __________for it.