To exercise more is a good way to        us against illness.

The little boy          his seat to an old lady on the crowded bus.

We should keep the door        because it’s cold outside.

Many students        math because they think it’s boring.

—Could I        a ruler from you?
—Sorry. I can’t        it to you. I’ll use it.

The shop usually        at 9 p.m. but now it       .

She often practices        English by         to the foreigners.

—What happened         you yesterday?
—I happened        meet my old friend, Lucy.

We stopped         and         because we were tired and thirsty.

Tom asked my friend        .