Recently our government policymakers are very ______ about the rapidly rising food cost.

In the old days, some wealthy people killed animals just for the ______ of it.

Jane was so ______ for the news of her lost child that she was almost driven ______.

In the meantime, the question facing business is whether such research is   the cost. 

If you are ________about Australian cities，just read the book written by Dr. Johnson.