A teacher's________to the cause of education is worth great respect of the whole society because it brings countless benefits to the development of society.
It is global warming, rather than other factors, _______ the extreme weather.
A that have led to B which has causedC which are causing D that has led to
To tell you the truth, the accident and the damage _______resulted in frightened me so much that I almost have given up driving ever since.
A that B it C whichD what
He said ______ his sister had passed the college entrance examination, and ______ she would go to college in about 20 days.
A that; /B that ; thatC /;/ D that; which