In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.

There’s no doubt _____enough concern must be paid to the problem of the stay­at­home children.

— Should people stop using their cars and start using public transport?— __________. The roads are too crowded as it is.

He is only too ready to help others, seldom, _____, refusing them when they turn to him. 

--How was your weekend, Rose?--Awful! This was the first time I ________ alone at home, bored to death.