--- Do you know whether scientists have ________a good way to deal with Influenza H7N9 or not?---Not yet .But they’re trying their best.

Every morning we        “Good morning” to others.

He is old, but he ____ have gray hair.

I used to spend all my pocket money on clothes and snacks. But now, I try to ______ some money for charities.

—I have bought a new watch .—Where and when        you         it ?