用

The box served him as/for a stool.

May I use your telephone?

by hook or by crook; resort to every trick/means

use up a whole roll of film

demand access to a telephone

save/conserve electricity

assume a fictitious name

make a good job of exercising one's power; use/wield one's power well

use a code name

devote a lot of space (to); use a great many words

It's no use arguing with you.

outlive one's usefulness

help out with the family expenses

He has no need of your charity.

The garden needs no watering.

Please help yourself to tea.

This bird employs its beak as a weapon.

His devotion/love was beyond words.

In Mao Zedong's graphic phrase, the Chinese people ‘stood up'.

The victory cost many lives.

arm oneself with knowledge

play tennis right-handed

address sb by his last/family name

defend one's motherland at the cost of one's life; defend one's motherland with one's blood and life

employ a hammer to drive a nail; hit the nail with a hammer

dissolve in water

put a match to sth

be printed in bold type

spend public funds on dinners and gifts

Hence this letter.