One way to       species under' threat of extinction - whatever the cause - is to remove them to zoos and parks and breed them there．

He tried hard to keep calm in face of the policemen, but the sweat on his forehead _________.

His generosity _______ him the reputation of “The most generous man” in his area. 

In order to finish the work time,the man in charge decided to       some more workers.

I was       in the middle of my call because I had no more pennies to put in the box.