（上海卷38）. Wind power is an ancient source of energy we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
I regret _________ you that you can't ________ the game.
| A．telling; join | B．to tell; take part in |
| C．to tell; attend | D．telling; participate in |
His health requires that he ________ to bed early.
| A．go | B．goes | C．went | D．going |
I shall never forget the day ________ Liu Xiang won the gold medal, _________ has a great effect on my life.
| A．when; which | B．that; which | C．which; that | D．when; that |
The place ________ the bridge is supposed to be built should be _________ the cross-river traffic is the heaviest.
| A．which, where | B．at which, which | C．at which, where | D．which, in which |
The factory produces half a million pairs of shoes every year, _________ are sold abroad.
| A．80% of them | B．80% of that | C．80% of the shoes | D．80% of which |