As we all know, the present world financial crisis still has a bad       on the development of the economy of every country.

Being able to speak another language fluently is a great ______ when you're looking for a job.

There is a 20 minute parking _____ here, so we must get back to the car very quickly.

I listened to Dr.Wilson’s lecture about the protection of wild animals,but I was unable to grasp its key _________.

He was courage and unselfishness and gained his comrades_________.