Capitalize "Y" in you since it is the start of a statement
Vain is the correct answer. Plug in each word given into the sentence and then read it to see if the sentence makes sense.
"We may try in credibility to solve our problems on our own.." Credibility is incorrect.
"We may try in predict to solve our problems on our own.." Predict is incorrect.
"We may try in forgive to solve our problems on our own.." Forgive is incorrect.
"We may try in vain to solve our problems on our own.." Vain is correct!
Hope this helps! (:
The stargazers are lying on the ground on their backs who are tired from looking through the eyepiece of the telescope. One gazer stands up and takes a peek again at the eyepiece which is small and black. He sees something and calls out to his friends. "I found it," he said. They look at each other without saying anything.