At the meeting place of the Yangtze River and Jialing RIiver ,one of the largest cities in china.

There is a bridge ______ the river. [ ]

We can have ___ bluer sky if we create ___ less polluted world.

What’s wrong?—I can’t do my homework now. Imy homework in the classroom this morning.

___ we know, in a chemical change, energy cannot be created, ____.