Tom usually walks to school but sometimes he goes _____.[ ]

Why are you so happy?—That’s because an old friend of is coming.

I found ______ not very difficult to keep away from the A/H1N1 Flu.

“Why don’t you go to the Science Museum?”—“I hear there’s ______ in it.”

You’d better _____ too much fried chicken. It’s not good for your health .