(2012浙江卷) According to scientists, our mental abilities begin to______ from the age of 27 after reaching the highest level at 22.
Rescuers are ______ for the safety of the two men trapped in the mine.
--- How many times have you been to China? --- In fact, it is the first time that I ______ here.
Please ______ the numbers and I’m sure they will ______ more than 1, 000.
The policemen had no ______ in finding the knife that the murderer had thrown.
An athlete can’t play balls well without severe ______.