There are________to show that a new, different city is coming out of its dark past. 

These overseas students who are studying in our college show great ________ for learning a new language.

While studying, fix your mind on what is really important, or you will _____ remembering nothing.

Making great efforts to struggle hard in your study，if ______，will possibly lead to your great success in the college entrance exam next year.

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