_____ of the new aircraft will start next year.

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

He is out of work now but he gets a good _____ from his investment.

一Do you think I should apply for the job?一Why not? If you make an effort，the _______ are that you’11 be employed．

Though__ __ came that he was completely defeated, he didn't lose ______.