The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as       of a great number of services.

She said the fun of reading books was different from ___ of any other kind．

Many of the students applied to the university , but ________of them is admitted .

What sense do you think ____ will_____ to argue about it?

I’d like to buy a present for my father’s birthday, ________at a proper price but of great use.

The time has come ______ we can make extensive use of nuclear energy．

---Keep _____ in mind that you have to be home by 10 o’clock.
---Ok, I will.

We decided to take a taxi．Luckily there was _____ waiting．

Not far from the school there was a garden,      owner seated in it playing chess with his little grandson every afternoon.

All of us found ______ difficult to work out the maths problem.