I originally studied / have studied engineering at university.  2. I've been trying / have tried to find a permanent job for a long time.
3. In my first job, I was / I have been responsible for marketing. 
4. The last job I applied / have applied for required applicants to speak some Chinese. 
5. I have been waiting / have waited for a reply for several weeks and I still have not received / did not receive any answer. 
6. How long have you been learning / have you learned English?  You speak really fluently.  ​

Still literally a few years ago the cell phone was very fashionable, but the extremely unusual occurrence. Today everyone has it practically, especially at inhabitants of the large cities. The wide choice of new tariff plans provokes people to speak by phone in increasing frequency. But is it safe? And that after all this such mobile phone: advantage or harm? About it speech also will go below.
The mobile phone can bring both benefit and harm

Day by day the dose of the electromagnetic radiation received by the person in days, grows. As soon as mobile phones appeared, appeared also disputes: whether their frequent use is harmful to our health or not. Opinions in this respect a little. Representatives of the cellular companies go on about advantage or at least safety of the mobile. They assure that the mobile phone can't bring any harm. Supporters of similar opinion refer to that wasn't carried out any serious researches in this respect. But they are mistaken.

Researches about influence of electromagnetic fields on a live organism are conducted some decades during which the advantage or harm of radiation is investigated. The World Health Organization founded even the special program B "An electromagnetic field and health человекаВ" to which around the world the close attention today is paid.

What suffers from radiation?

It was proved that the systems of the person most sensitive to radiation: immune, endocrine, nervous and sexual, and all organism suffers from the radiation of the cell phone in general. And the harmful effect has property to collect over time therefore pathology of the central nervous system, a brain tumor, a blood cancer (leukosis), hormonal violations develops. Electromagnetic fields especially can be dangerous to children, pregnant women (impact on an embryo), people with hormonal violations, with cardiovascular diseases, allergic persons and people, whose immunity is weakened.

Long ago influence of the cellular person on a brain is proved.

My sister is sick. She's feeling not so good. or She feels badly.I will be glad to see you again.

My brother and I will meet you at the airport. He's pleased about it.

Eric promised to show us how to surf and observe the birds. It's interesting. While we will go to excursion a (the) mother with Barbara will be at the zoo. We believe that by the time she is recovering. 

Give away to your father a book "The life and adventure of Robinson Crusoe", to your mother a Culinary book, to Eric a cd about adventures, to Barbara a doll