---Do you know the danger caused by smoking?---Yes, too many cigarettes can lead to_______ lung cancer.

Actually,       works hard can be      they want to be, whether it is a pilot, an engineer or a manager.

The letter is from my sister, ______is working in Beijing. 

Jason is a man of great determination and he will keep moving forward____  the result．

_____ great progress we have made, we should not be conceited.(自大的)