With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.

I won’t give in ________ great difficulties I come across in my life.

No matter how fast we worked, ____.

In his lecture, the professor referred to the belief ________ the elderly are wise, ________ is particularly dominant(支配的) in Chinese culture.

As to his criticism, I don’t mind it in the least, but______is how he does it that I can’t take.