It was an exciting moment for these fans this year, _____ for the first time in years they saw their favorite singers.

He was very rude to the customs officer, ____ of course made things even worse.

The first snow fell in December in our province last year,         was uncommon.

I bought three books, but none of _______ is interesting.

Recently I bought a beautiful car, ________ was reasonable.
A. of which price the price of whose     C. the price of which   D. which price

Disappointingly, the new computer, ________ he loves a lot,   breaks down frequently.

I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.

The expo is being held in Shanghai, _______a lot of advanced technology is shown for the first time.

The company was willing to provide us with what we needed, _____ made us excited.   

The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.