After a long discussion about the advantages and disadvantages of the plan, they finally came to a(n) ________that it was practical.

—It’s so hot. What about getting a drink?  —Good idea. It’s my___ .

(2013·浙江，4)As the world's population continues to grow，the ________ of food becomes more and more of a concern.

It was a real race __________ time to get the project completed in such a short time.

Lee was faced with the    of whether or not to return to his country after he got the doctor's degree in America