(2013·江西赣中四校高三第二次联考)A special title was awarded to Zhang Lili, an ordinary Chinese teacher, ________ her act of bravery to rescue two students at the risk of her own life

Have you bought the same book ________ I referred to yesterday?

______ by the beauty of nature, the girl from Londondecided to spend another two days on the farm.

I would appreciate ____ if you could come and help me with my work.

The problem is too difficult for him. He solve it.