Переведите следующие предложения на русский язык

Запомните: since – так как; поскольку; с, c тех пор, как; со времени

1. Only since 19 century A.D. people have begun to use petroleum as one of the most important sources of energy. 2. Since we know all the properties of this substance, we use it in our experiment. 3. We did not finish our work since we had no necessary mixture of fluids. 4. We have done many interesting investigations since the foundation of this research laboratory at our plant. 5. I have not carried out any experiments in the laboratory since I graduated from the Institute. 6. Since such applications didn’t require large amounts of oil, ancient people managed with oil they got from the surface seeps.

Переведите предложения, обращая внимание на значение слов “only”, “the only”, “for”.

Запомните: only – только

the only – единственный

for – для, в течение; так как, поскольку, потому что

1. Only from ancient manuscripts man has known about different properties of oil. 2. The only way to use petroleum in medicine is to study its curing properties.
3. Ancients used petroleum for the illumination of their dwellings. 4. For the purpose of illustration let us consider the chemical basis of oil. 5. The scientists have used this substance for it is more important. 6. For a long time the question of oil origin was not solved. 7. For oil doesn’t conduct electricity, people use some of its products in the manufacturing of insulators. 8. The geological science has not yet given a clear explanation for the petroleum formation.

Переведите следующие предложения на русский язык.

Запомните: very (с прилагательными и наречиями) – очень

the very book – именно эта книга, та самая книга

1. Very often petroleum engineers drill deeper wells. 2. This is the very substance we need in our experiment. 3. This scientist knows the theory of organic origin of petroleum very well as he works very hard. 4. The very first step to use the scientific method is to obtain some facts by observation and experiment. 5. In the very nature petroleum is oily liquid. 6. In a very calm, shallow sea, dead plants and animals fell to the bottom.