He lives in a house ______ windows all face the north.
He is a very kind-hearted man, ______ is always ready to help others.
The first thing ______ we must do is to mend those shoes.
She has two daughters, both of ______ work as engineers in an institute.
He is wearing such a strange coat ______ will make everyone laugh at the sight of it.
This is the most interesting story ______ he's ever heard.
October 1st, 1949 is the day ______ the new China was founded.
Can you tell me the reason ______ he was late?
Can you think out a situation ______ this idiom can be used?
He is the man of rich experience, from ______ much can be learned.
______ is known to everybody, Taiwan is a part of China.
The reason ______ she gives for not coming to the party is that her mother won't let her go.
My family climbed up the hill, on the top of ______ we had a picnic.
Can you tell me the name of the company ______ you visited last week?
Last month we went to a chemical works, ______ was set up in the 1960’s and ______ my father has worked for dozens of years.