The fire was so strong that the firefighters couldn’t get it under control, so some soldiers were _______ to help put out the fire.
The first textbook _______ for teaching English as a foreign language came out in the 16th century.
Careless driving _______ a lot of highway accidents.
We won’t give up _______ we should fail ten times.
In some parts of the world, tea _______ with milk and sugar.
One ought _______ for what one hasn’t done.