.He’s unlucky, and he’s always suffering _____ luck one after another.
Harry, you can’t go out since you haven’t finished your homework; ______, there is going to be a heavy storm.
--- What a beautiful day!--- Yes, it is _______ that I’d like to take a walk.
—How about going out for a picnic on Sunday morning?—Hmm, ____.The weather is quite warm these days.
The driver ____ have drunk a lot before the accident, but I'm not quite sure of that.
When ____ to compare the education system of China and Britain, the professor gave no answer.