Thanks to the media ,much notice has already been ____the pr

Thanks to the media ,much notice has already been ____the pronlem with the left-behind children in rural areas.
A focused on B paid to C taken of 为什么选C ,
Peace-keeping is ____UN'smain duty ,and it also has programmes for____ education ,health and so on in more than 170 countries.
B / ,the C the,/ 为什么选C ,B
Because if the lack of food and water ,the suspect ____in the cave couldn;t help but _____in to the police.
A hidden give B hidding to give 为什么选A
When ____prices ,we have to take into consideration the quality of the goods.
A compared B being compared C comparing D having compared
为什么选C?A不可以吗?其它选项都怎么回事?
请高手赐教,