—We all had a lot of fun at the barbecue yesterday. Pity you
weren't there.
—I really should have gone with you but I________on some
remaining problems.
A．worked B．was working
C．would work D．would have worked
—Don't use my handkerchief to wipe the table，gentleman.
—Oh, I' m very sorry.I________clearly.
A．didn't see B．hadn't seen
C．wasn't seeing D．can't see
The school rule states that no child shall be，unless________by an adult，allowed out of the school during the day.
A．was accompanied B．accompanying
C．accompanied D．being accompanied
—How do you deal with the disagreement between the company
and the customers?
—The key________ the problem is to meet the demand____
____by the customers?
A．to solving；making B．to solving；made
C．to solve；making D．to solve；made
Prices of daily goods________through a computer can be lower than store prices.
A．are bought B．bought
C．been bought D．buying
The poor little boy________by his heartless parents was seen begging in the street.
A．abandoning B．to be abandoned
C．having abandoned D．abandoned
