My father served in the army in        when he was in         .

When we visited Zhou Zhuang again ten years later, we found it changed so much that we could hardly ________ it.

(2013·哈尔滨四校高三一模)In fact fuels we burn and plant food we eat ________ their chemical energy in the form of heat.

The animal makes a strange sound, slightly ______ the bark of a dog.

The weight of the moon is only about _____ of that of the earth.