Как объяснить орфограмму в слове "стройным" -

Букву "й" и , что  одной "н"?

Найдите пожалуйста проверочное слово.

 

 

 

 

 

 

самый маленький город на планете земля

Read the text and write the questions.

Vickie and Julia go on a picnic.

Vickie and Julia are two girls who live in one town and go to school together. They like to spend their free time together too. Last weekend the girls went on a picnic with their families. They did not take many things : it was difficult to walk with them uphill. Vickie’s parents took something to eat and to drink. Julia’s parents took a small tent, badminton rackets and a video camera. At the picnic the girls gathered nuts, played different games and sang songs. Their parents sat in the sunshine talking. Little Roxy, Julia’s dog, was happy too. It had a good run about the forest. It was a warm lovely day and everybody enjoyed it. When they were all back home, the company watched the picnic again on the video. 1)Who……………………………………………………………………………………………………? 2)What……………………………………………………………………………………………………? 3)Where…………………………………………………………………………………………………? 4)How……………………………………………………………………………………………………? 5)When……………………………………………………………………………………………………?

CU(OH)2+H2S=

Ba(NO3)2+H2s=

CACO3+H2S= 

можно ли считать взаимоприемлемыми два утверждения: "Крепостничество тормозило развитие экономики России во второй половине 18 века"  и  "Крепостничество обеспечивало экономическое развитие России в этот период"?