I hear you have got a ticket ____ the Opening Ceremony of the Beijing Olympics. — Yes, I got it ____ my uncle. [ ]

There used to ________ a clean river in the village, but now it’s dirty.

____ it is to play football on such a cool afternoon.

Fortunately, the illness is fully treatable if _____ within ten days.

Sorting wastes is good ________ the environment.[ ]