It remains to be seen ________ this plan is practical enough to keep the project going.
46 Our manager allowed _______to take a holiday next week.
47. Although he 's wealthy,he spends_____________ on clothes.
48. They were all tired, but _____ of them would stop to take a rest.
49. I don’t know whether small oranges are sweeter than big ______.
50. When they met, they stopped and said hello to_______.