nal is not necessarily a reliable record of facts, for the writer’s impressions color the telling of events.

The boy was so careless that the glass fell from his hand and it ______ on the floor.

It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．

Only in this way ____ make progress in your English. [ ]

The old couple has ____ a lot since their only son was killed in an accident two years ago.