____the book if you are free, and you will learn a lot about how to study English .
There is a police car in front of the house of our neighbour's. _____ do you think _____ ?
It's dangerous to let the children who are _____ go swimming in the river.
_____ do you suppose he took to the park with him?
What he has learned through practice before _____ him a lot in his future work.
He told us _____ she had done.