It is __________ to spend money on preventing illnesses by promoting healthy living rather than spending on trying to make people ___________ after they are ill.

Up to now, the little boy is still unable to _______ to us what he meant just now.

Some so-called climate travelers _______ in one placefor a few months and then move on to some other places as the weather changes.

a Chinese athlete, Liu Xiang is looking forward the2008 Olympic Games.

The volcano________in 1946 after one hundred and twenty years of silence.[ ]