He who has never tasted what is bitter does not know what is sweet.
Space and oceans are the new world which scientists are trying to explore.
His laughter， which was infectious， broke the silence.
I told the story to John， who told it to his brother.
We wish to express our satisfaction at this to the Special Committee， whose activities deserve to be encouraged.
You， whose predecessors scored initial success in astronomical research， have acquired a greater accomplishment in this respect.
Although he lacks experience， he has enterprise and creativity， which are decisive in achieving success in the area.
ceived the letter that announced the death of your uncle.
They worked out a new method by which production has now been rapidly increased.
There is a man downstairs who wants to see you.
In our factory， there are many people who are much interested in the new invention.
We used a plane of which almost every part carried some indication of national identity.
She had a balance at her banker‘s which would have made her beloved anywhere.
A driver who is driving the bus mustn‘t talk with others or be absent-minded.
He showed no further wish for conversation with Mrs. Smith， who was now more than usually insolent and disagreeable.
Men become desperate for work， any work， which will help them to keep alive their families.
He insisted on buying another house， which he had no use for
He wishes to write an article that will attract the public attention to the matter.
He is collecting authentic material that proves his argument.
They tried to stamp out the revolt， which spread all the more furiously throughout the country.
She was very patient towards the children， which her husband seldom was.