Whenever you     a present, you should think about it from the receiver’s point of view.

 Some people go back for their education to ________ another degree or diploma (文凭) to impress the society.

The old man was taking a walk, ____ by his grandson. 

--I would why he ____so strangely these days. --Recent pressure at study may account for his behavior.

— Don’t put the waste on the ground, young man. — Oh, I’m sorry. I ______ the dustbin there.