—Did the book give the information you needed?—Yes. But _________ it, I had to read the entire book. 

．(2013·江西重点中学一模)________ too much for his intelligence, Harry often overlooks the importance of effort.

I looked up and noticed a snake ______ its way up the tree to catch its breakfast.

Professor White has received a letter ___ to give a lecture in Peking University.

(2013·青岛一模)All flights ________ owing to the heavy fog, many passengers could do nothing but take trains.