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

--_________ are the jackets?     --Black．

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

At the foot of the hill you could hear nothing but the ______ of the running water.

All the ___ in our school enjoyed themselves on March 8th because it was their own holiday.