In those days, our _________ concern was to provide people who were stopped by the snow storm with food and health care.
Tom put his heart into the wildlife research, and finally, his efforts ____ him great success and fame.
You'd sound a lot more polite if you make a request ____ a question.
____, the pay isn't attractive enough, though the job itself is quite interesting.
Tom pretended ____ it, but in fact, he knew it very well.
Little Johnny felt the bag, curious to know what it .