—I can’t find Mary. Where’s she?—Sorry, I don’t know ______.
--- Have you ____ your key? --- No, I’ve ____ for it everywhere, but I can’t find it.
My brother always ____ his lesson, so he is a top student.
The dog is very ___, and it can work out the problem____.
Danny is always very happy when he has something ___.
Daming likes cars. He enjoys _____ models cars of all kinds.