—Can I pay by credit card?
—Yes, _________.
| A．with pleasure | B．take care | C．no problem | D．don’t mention it |
— ________ he ________ anything about this historic site?
— Yes. That’s why he suddenly becomes so obsessed with it.
| A．Has; read | B．Does; read | C．Did; read | D．Had; read |
You should never base anything on a theory that _________ impractical in practice.
| A．is proved | B．prove | C．proves | D．proved |
With my hand-held Reader, I’ve read more books in the past six months than I ________ in the past six years.
| A．doing | B．did | C．have | D．do |
Since then, more than 2 billion apps have been downloaded at prices ________ free to $900.
| A．ranging between | B．ranging from | C．rang between | D．rang from |
My arrival was timed perfectly; it was the second weekend of November, when the world largest wine auction ________.
| A．held | B．was being held | C．was held | D．was to hold |