．Now natural disasters happen one after another, ______ warns man to treat nature kindly.
| A．it | B．that | C．which | D．as |
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 |