Obama’s success in presidential election proves that the color of one’s skin shouldn’t be a________to success.

Jess was sad and her friend helped her ________the first awful weeks after her husband Bill died. 

According to a recent U.S. survey, children spent up to 25 hours a week ____ TV.

Our success was largely _____ the good cooperation of all team members.

These overseas students who are studying in our college show great ________ for learning a new language.