语法填空
（1）It is difficult to figure out a global population of polar bears as much of the range has been ________ (poor) studied; however, biologists calculate that there are about 20,000-25,000 polar bears worldwide.
（2）On our way to the house，it was raining ________ hard that we couldn't help wondering how long it would take to get (get)there. It was in the middle of Pearl City.