________________ are at the top of the living world.

Comfortable life means

The record of techniques, skills, formulae and facts is called _________.

We can control and even make _____ of dangerous animals.

Person having good knowledge of a science is called __________.

The invention of instruments and engines has made life___________________.

What is shown in the picture?

______________ device can do large number of jobs in a moment with absolute correctness.

We have made aero plane, helicopter, hot air balloon, etc. to ___________.

Who is shown in the picture?

All human invention are gifts of _______.

What is shown in the picture?

Those things which are not made by man are called_________.

Natural things can be ___________.