6.Answer the questions. 1)Look at the sentences.
When do we say There isn't a... and when do we say There aren't any...?
a)There isn't a computer. b)There aren't any chairs.
2)Look at the sentences.
What is the difference?
a)There are nine photos. b)There are some photos. ​

The legend of Lake Naroch. Many years ago there … (lived) a girl called Nara. She … (could) sing very well and play the psaltery .She … (loved) a young man and … (wanted) to marry him. One day she was sitting near a large beautiful lake when a rich man … (saw) her. He … (liked) Nara so much that he… (wanted) to marry her. As Nara….. (had) a groom she… (did not want) … to marry the rich man. But the rich man … (was) very stubborn, and his servants … (killed) Nara’s groom and … (took) Nara to the rich man’s palace. The girl … (was) so unhappy that when everybody was sleeping, she … (set) fire to the palace , and … (ran) away. When the rich man… (learnt) about it, he … (sent) his servants after Nara. As she … ( could not) run away from them, Nara … (dived) into the lake and… (died). From that time the lake was named Lake Naroch.

Morphine was isolated from opium by Serturner in 1806.
Physics, chemistry, botany, pharmacology are mastered by pharmaceutical students.
Specialists familiar with such technologies were demanded by an increasing variety of drugs and their complex compositions.
Морфин был выделен из опия Сертурнером в 1806 году.
Физика, химия, ботаника, фармакология изучаются студентами-фармацевтиками.
Специалисты, знакомые с такими технологиями востребованы при увеличивающемся разнообразии препаратов и их сложных композиций.