Complete the text with the missing words.

The completed text is: 'We all observe the diversity of events which occur around and in our environment. But there are some people who do not give up their inquiry after observing it, but seek to find out an answer why and how the events occur or try to reveal the mystery of the universe through regular experiments. Dedicated, inquisitive and creative men who always work for the welfare of mankind are called scientists. Generosity, modesty, firmness in the search for truth, creativity, tolerance and above all philanthropy are the characteristics of a scientist. Their contribution to the service of mankind cannot be denied. Innumerable people of the world are indebted to the scientists. So, we can say that a scientist is that person who does not give up observing the events which occur around in the environment. Every scientist follows scientific method to take decision. Scientist is a person who is an expert.'