It’s eleven p.m.. Mary is still working _____ the light. [ ]

Whathonest boy! And he isbest student of all.

I don’t think it very expensive to buy a family computer here.—Really? I’ll buy _____ next week.

One of the most important questions they had to consider was ______ of public health.

What’s wrong with you?—— Yesterday I argued ______ Tony ______ the thing.