The little girl has been in a poor _____ of health since she was born, which has made her parents very worried.

It is well known that Madam Curie won two Nobel Prizes for her scientific ______.

As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

It is a pity that none of the ______ stopped ______ the poor man lying there, begging. 

Don't leave matches or cigarettes on the table within the _____ of little children.