—I’d like to take a chance and run a business.
—Do you know about the local market? ___________.
| A．No problem | B．Better play it safe |
| C．Do as you please | D．Think nothing of it |
My pain _____ obvious the moment I entered the office，for the first man I met asked pitifully，“Are you feeling all right？”
| A．could be | B．could have been | C．must be | D．must have been |
You should have put the milk in the ice box. I expect it ___undrinkable by now.
| A．became | B．had become | C．has become | D．becomes |
Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.
| A．are to challenge | B．have challenged |
| C．are challenging | D．have been challenged |
— Can you give me the right answer?
—Sorry, I ______ . Would you repeat that question?
| A．hadn't listened | B．haven't listened | C．don't listen | D．wasn't listening |
It’s politely requested by the hotel management that radios _____after 10 o’clock at night.
| A．were not played | B．not to play | C．not be played | D．did not play |