______ the new life in Qingdao, the old man lived happily with his son after leaving his home in the countryside.
| A．Accustomed to | B．Accustoming to |
| C．Having accustomed to | D．having used to |
—Must I turn off the gas after cooking?
—Of course. You can never be____ careful with that.
| A．enough | B．too | C．so | D．very |
I'm certain David's told you his business troubles. ______, it's no secret that he owes a lot of money to the bank.
| A．However | B．Anyway | C．Therefore | D．Though |
Although my grandfather is in his eighties, he is still as ________ as a young man and hates sitting around doing nothing all day.
| A．enthusiastic | B．intelligent | C．energetic | D．sensitive |
—John is very ______ .—if he promises to do something he’ll do it.
| A．independent | B．confident | C．reliable | D．flexible |
In those days, our ________ concern was to provide people who were stopped by the snow storm with food and health care.
| A．normal | B．constant | C．permanent | D．primary |