1.①You cannot accept an opinion offered to you unless itis based on/upon facts.
②a.Based_(base) on a true love story, the film wewatched yesterday is highly thought of.
b. Basing_ (base) on the fact, we made this decision.
③As far as I 'm concerned, common hobbies are thebasis(base) of making friends.
They have to have a basic(base) understandingof computers in order to use the advanced technology.

2.①He is not content with his present position in the company.
2They are not content to do_(do) only what theyare told to do.
3emptied the _contents (content) of the fridge intocarrier bags.