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．may be challenged |
| C．have been challenged | D．are challenging |
It is usually cool in April in Chongqing, but it sometimes ______ be rather hot for a few days.
| A．can | B．must | C．shall | D．ought to |
Two decades ago this city was ______ but a small unknown town.
| A．something | B．anything | C．everything | D．nothing |
—Why didn’t you go to Shelly’s birthday party yesterday evening?
—I ______ but I had an unexpected visitor.
| A．intended to | B．had intended to | C．was intended to have | D．had intended to have |
He didn’t attend the competition ______ he was ill at the time.
| A．in that | B．in which | C．where | D．when |
After the earthquake, the poor girl was found ______ under the ruins of a church.
| A．burying | B．to be buried | C．buried | D．being buried |