— I tried it out in this way, but I failed.— Why not it in some other ways?
________ is good for your health.
—Are there any trees on _____ sides of the new street? —Yes, there are.
While I _____ my homework in my room, my mother _____ in the kitchen.
We ____ _each other since I left Shanghai.
—Did that sportsman win ____ gold medal at ____Athens Olympics? —Yes, he did.