Eckels travels with Time Safari because he wants to Hunt dinosaurs.
The answer is C.
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! (:
In April of 1869, George Westinghouse obtained a patent for one of his most important inventions, the air brake.