Light-to-moderate smokers were ________ to die of sudden heart problems than those who had never smoked. 

The old man was tired and walk more slowly but he home_______.

As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.

Our country will try to make greater progress in improving people's living conditions，________low­income families.

The house still needed a lot of work, but ___ the kitchen was finished.