Which sentence is correct?
who do you want to sing?
whom will sing next?
give it back to the one whom gave it to you.
i know the person who asked to go.

he has become more humble and patient in battle.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

your answer is b. tense. hope this .