---James is good at sports. He plays ______ basketball well, and he plays ______ piano well, too. --- Wow, he’s so great!
Bob doesn’t know _____ to write about.
We must be strict _____ ourselves and strict _____ our work.
Now more and more people prefer__to__in order to reduce the air pollution.
They would rather___colours like orange or yellow than blue or white.
Do you like ____ books ?