Schools in the south tend to be better equipped，_______those in the north are relatively poor.

I hate traveling by air ______ you usually have to wait for hours before the plane takes off. 

______ is often the case in science, there is no simple answer

 Would you be ____ kind as to step this way, please?

 Accurately, my granny has got no hobbies at all ______ you think watching TV as one.