That the sun moves around the earth is the truth.（ it is the truth that……）
Whether it is raining is not known.
It is not known——computers will one day have vision as good as human vision.
A.whether B. if C. that D. how
It goes without saying that we are not living in a traditional society.
Who will come to the meeting remains unknown.
翻译题 ： In a sense， what he said amounts to threat.
Your greatest fault is that you are careless.
The problem is what we should do to help him.
We feel proud that our team has won every match this year.
He wasn't sure whether he should stay or leave.
Are you certain who he is
（fact， news， idea， opinion， concern， hope， theory， decision， discovery， conclusion， report，
order， question， problem， belief， truth， answer， statement， promise， possibility.）
The news that he intended to come gave us much pleasure.
When I studied， the bell rang.
She was going upstairs when suddenly the light went out.
He had no sooner died than / he had hardly died when the family arguments began.
He live where he liked.
He was late because he missed the bus.
Now that you mention it， I do remember.
I'm in a slightly awkward position， in that my secretary is on holiday at that moment.
We have so arranged matters that one of us is always on duty.
Bring it closer so that I may see it better.
He brought a big house so（ that） he had more space to paint in.
He made such a good speech that he won warm applause.
翻译题 ：The brothers looks so alike that it is difficult to tell them each other
If I make a promise， I keep it.
I'll lend you the money ， as/so long as you take my advice.
These messages will become rubbish unless some measures have been taken.