I need to key down before I go to bed.
key * in +
It took me ages to key in all the information into the database.
key in on +
They keyed in on the person they believed had done it.
key on +
We will key on the opposing team's lack of skills on defense.
key to +
改變...以適應 (某種需要) － 通常用被動態
Promotions are keyed to people's abilities.
key * up +
The noise got us keyed up.