According to scientists, our mental abilities begin to______from the age of 27 after reaching the highest level at 22.
I would appreciate __________ back this afternoon.
I would appreciate __________ if you could teach me how to use the computer.
I really appreciate __________ to help me out.
—I have to cut the expenses to meet the daily needs. —So do I, for the prices of goods _________ going up these days.
Professor Wu keeps __________ his students that the future __________ to the well-educated.