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________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists.

________ some students are not aware of is ________ difficult life can be if they are not devoted to study.

________ you are supposed to do ________ you don't like a thing is change it. Don't complain.

It is by no means clear ________ the president can do something to end the strike.

________ was known to them that the boss had broken his promise ________ he would give them a rise.

________ song Jay Chou sings will become popular pretty soon.

What I am concerned about is ________ they could fit in with society and how we can create more opportunities for them.

When it comes to gossip(流言蜚語), learn to keep your mouth shut ________ you'll avoid trouble.

It was several years ________ I realized ________ David had lied to me.

—How do you think I can make up with Johnson?
—Set aside ________ you disagree and try to find ________ you have in common.