For question 36-42, complete he sentences by filling in each of the gaps one appropriate preposition.
There is an example at the beginning (0)
36. The on-going problem ______ essence is an economic decline.
37. Good ideas sometimes do not work out well ______ prospect.
38. The refugees are ______ a sad plight, without food or shelter.
39. She wants to get rid of such a bad man ______ good.
40. iPhone 6 is so hot that all shops are _______ stock.
41. New teaching methods prevent students from learning _______ rote.
42. Today is not yet the pay day, so he has to buy food ________ credit.
43. All the speeches were ________ to the point, except for his, which is not at all relevant.
44. The house has been ______ guard since the police received the threat of some unknown men.
45. Never eat oyster ______ season, they may not be very good for your digestive system.
46. ________ promotion, he has moved to New York to take his new post.
47. I will support your scheme as long as it is ________ reason.
48. Your suspicion is _________ foundation as she is the most decent woman I’ve ever known.
49. She used to be one of the most popular teachers in the school, but her reputation is ________ the
wane now.