Some people think _______about their rights than they do about their responsibilities.  

Scientists are trying to develop a special material, _______ they will make use of in space.

She'd lived in London and Manchester, but she liked     ______ and moved to Cambridge.

--- ________ of them knows the answer. What can we do now?  --- Let’s ask a third boy for help.

I like _____ when my parents are friendly to me.