—After P.E., I often feel very thirsty.    —Why not buy some ________ to drink?

—Are these your ____________, Jack? —Yes, they are. I like them very much.

It is well known to all that the kilogram is the international         of weight.

Heilongjiang is in the __________of China.

I like English very much. I never miss a ______ to practice English with foreigners.