When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
The monument was built in honor of the explorer who was believed _____ the river.
It was getting dark; I found a car _____ in a pool by the side of the road.
The old farmer, _____ the badly injured and burnt soldier, came out of the burning farmhouse, calling continuously for help.
To answer correctly is more important than _____.
And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.