I bought a new type of cell-phone, which was the ____ of all my classmates.
_____________ the sun for too much time will do great harm to your skin.
You should study the details of the policy________ before you sign it.
Trees are good for man. We can’t plant them ______ many.
—I saw Mr. Black on the playground this morning.—You ________. He’s still on holiday in Sanya.
The officer commanded that everyone passing by________ that day.