I keep medicines on the top shelf, out of the children’s       .

There’s a(n) ___ of peace and calm in the countryside, completely different from that in the city. 

A landing on Mars is within the _____ of current physical theory.

Despite such a big difference in ___ towards what one eats, there is no doubt that people in the west regard the Chinese food as something special.

.The traffic slowed down because of the heavy snow in Yushu county, presenting a new __________ to the recovery from the earthquake.