As is natural, a man as old as he _____ be very forgetful.
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 ______.