With which of the following topics is the passage primarily concerned?

The manager or his secretary _______ to give you an interview.

Miss White ________ her parents is going to pay a visit to the Great Wall.

She hasn't paid as much attention to her children as she ______ since she _______ working.

Which is good for such an old lady like her is that she is healthy enough to cycle.

I supposed, as ______ we all, that the meeting would be cancelled.

Unfortunately, the solution to this problem is neither simple nor ______.

We should keep our freezer full ______ it runs more efficiently than an empty one.

It is the underserved ________ that damaged his life and his family.

Her business must be going rather well, _______ by the car she drives.

..... as taste is really a composite sense made up of both taste and smell.

She's read this book twice already. That's why it's so ______.

I was kept awake for most of the night by the _______ of a mosquito in my ear.