While Mary ___ a letter, the children wereplaying outside.

e me, I want to buy some milk, but Ican’t find a supermarket.—I know ______ nearby. Come on, I’ll showyou.

He hurried home, only_________ his keys had been left in the office.

What _____ did you do last night?— Nothing[ ]

If you _____ to something different, for example to a different system, task, or subject of conversation, you change to it from what you were doing or saying before.