-What do you think of the book? -Oh, excellent. It is worth _____ second time.
It is reported that _________ schools are improving their IT environment.
Give it to _____ you think can do the work well.
The problem is _____ we can master modern science and technology in a short time.
. He ______ live in the country than in the city.
--- " ______ he open the door?" --- "Yes, please."