One of the consequences of our planet's being warming up is a（n）_______ in the number of natural disasters. 

Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.

Often looking at your daily behavior from a different ______ will help you change your  actions for the better. 

—Why is Peter working so hard these days?.—The _______ of failing the exam next week makes him do so.

Every weekend my younger brother will go to help the old man far away my house,for which he often received some            from the old man,such as a pencil and some sugar.