I was tired and couldn't………. on doing my research project properly.

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

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

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

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

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

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

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.

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

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

Although she is very popular, she is not ________ her sister.

Poaching ____ the greatest threat to many species.

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