In the cross-lake swimming race, a boat will be ____in case of an emergency.

It was the most boring report we had ever had. It ___ four hours.

The quality of a processed food largely ______ the raw material and the way it _______. 

 —What’s the girl like ? —She was a brave girl . She fought bravely and her enemy had to _______  her at last .

Pierre Curie stopped his research and _______ Marie in the search of an unknown material.