The post office is near here. You can go there _____ foot. You don’t need to go there _____ a bike.
--- Where’s my basketball? --- It’s _______ the door.
–Is this your book? –Yes, ________.
This is ______ ruler and that’s ______ eraser.
—_______ can I keep the books? —Two weeks.
I think _______ necessary for you _______ breakfast.