---What on earth are the police busy with? ---They have been looking into how the plane crash _______.
My sister was always _____ and careful while I would get excited and upset by the slightest thing.
I came here with your mother ________ to see you.
How did all these _________?
It’s _______ hot here. We can’t stay here for a long time.
Please tell me the way you thought of _______ the garden.