_______ word “PM 25” repeatedly appearing in________ media reports, the public can’t help wondering what it really means

He decided to _________the job after he quarrelled with the manager. [ ]

There are so many kinds of Mp3 in theshop. We can’t decide ________ .

Do you believe some special dogs can do things ______ man

I support your decision, but I should also make it clear that I am not going to be ________ to it. [ ]