She kept _________ hard at her physics and finally caught up with us.
It’s raining heavily. We have tothe picnic.
---There is a book ________ on the ground. ---Let’s ________ and ask who lost it.
It takes more time to go there by train than by bus. It’s by plane of the three.
—Could you tell me.? —Yes, it will start at nine.
The girl .was in red was our monitor.