Simulation, reliability, conservation, sustainable, safety, conditions, samples, relationships, excessive, hazards. The purpose of ecologists’ job is to study the 1) of people and their environment.
They are concerned with 2) of environment.
One of the ecological key ideas is the idea of 3 development. The methods used in their work include collecting air, water, plants 4); analyzing the collected data; making 5) models in order to evaluate possible solutions.
The purpose of industrial hygienists’ work is to minimize 6)at a workplace and to improve working 7)
Harmful factors at an enterprise include dust, vapors, chemicals, 8) noise, radioactivity. One of the tasks on industrial hygienists is to test health equipment on 9) They make recommendations on improving 10of worker.

Read the list of requirement for the job of ecologist. Agree or dis- agree with each item in the list. Prove your ideas.

Example:
Ecologist really needs keen analytic mind because he has to do research, analyze data and make conclusions.

Keen analytic mind;
strong essay-writing and report-writing skills;
excellent communication skills;
ability to work either independently and as part of a team;
physical stamina;
love of the outdoors and wildlife;
ability to learn new concepts;
ability to be objective.

Grammar Exercises
Use the following verbs to make up imperative sentences.
Take, go, come, open, close, read, sit, stand, put, etc.
1…. here! 2. … to the table! 3. … the book! 4. … not … down! 5. … not … the door! 6. … the pen! 7. ... not … the window! 8. … the bag! 9. … the book on the table! 10. … not … the bag on the chair! 11. … nearer!

Tell children at school what they should do to be fit.
Model: It is good to go in for sports. – Go in for sports!
It is nice to spend much time in the open air.
It is healthy to eat more fruit.
It is good for your health to do morning exercises.
It is pleasant to go for a walk.

Now tell children not to do the wrong things.
Model: Smoking is bad. – Don’t smoke!
It is dangerous to walk late at night.
It is not good to be lazy.
It is not healthy to sit at the computer too long.
It is bad to be impolite.

6. Use “Let’s” or “Let’s not”. Insert the verbs: tell, stay, hurry, have, make.
We don’t want to be late. .
We want to keep this a secret. it anyone.
We want to be careful. any mistakes.
We don’t want to go out now. at home.
We don’t want to work anymore. a rest!

Make up polite requests (you may continue the list).

Order
Begin reading the text! Will you begin reading the text, please?
Translate this sentence!
Hand out the test-papers!
Bring a piece of chalk!
Clean the blackboard!
Air the classroom!