The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
—May I have another chocolate? —Yes, of course.___________.
Shortly after the accident, two___________ police were sent to the spot to keep order.
Mr. Zhang gave all textbooks to all the pupils, except___________ who had already taken tem.
Besides Tom, ________ Crosettes have two other sons, __________ of whom are all interested in making model planes.
Nobody noticed the thief slip into the house because the lights happened to__________.