To survive in the world, we have to act _______ others, but to survive as ourselves, we have to act alone.
I couldn’t help ______if the bus was late.
Don’t respond to any e-mails ______personal information, no matter ______ official they are.
She may have missed the train, ______ she won’t arrive for another hour.
There are more opportunities for disabled people to make______ contribution to______ society.
---What’s wrong with my stomach? ---There is nothing serious; you can __________.