There might be life on other planets, but so far scientists haven't found enough ________ to prove it.

Although chatting on line has exploded in popularity in recent years, there is no ________ for a face-to-face conversation.

In my opinion, you can widen the _____ of these improvements through your active participation. 

“Did you get _____ to the party?” “Yes, I replied to it this morning.” 

 After years of war, the people in that country were eager to live in_________.