er to get happiness, many people chase afterreputation or money aimlessly. However, in most cases, real happiness isactually _________.

The time the old man devotes ____ English at home is very important to him.

In order to________a good knowledge of English，he gave up his job and went to Britain.[ ]

David didn’t give up _________ he had failed in the experiment four times.

The air holds the feather back more than it ___ the stone.