Поставить предложения в past perfect i couldn't answer the question because she was hungry because my mother worried because they were late because the boy was pleased because he arrived at john's the house because

Ятак понимаю, надо продолжить эти предложения, поставив их  вторую часть в past perfect. 1. i couldn`t answer the question because i hadn`t been ready for the lesson. - я не мог ответить на вопрос потому, что не был готов к уроку. 2. she was hungry because she hadn`t had a lunch break. - она была голодна, потому что у нее не было времени на обеденный перерыв. 3. my mother worried because i hadn`t answered her phone call. - моя мама беспокоилась, потому что я не отвечал на ее звонок.  4. they were late because it had been a rush hour on the street. - они опоздали потому, что попали в час пик на улице. 5. the boy was pleased because he had found his christmas present under the new year tree. - мальчик радовался, потому что нашел свой  рождественский подарок под новогодней елкой. 6. he arrived at john`s house because he had finished his project and needed john`s approval. - он приехал к джону домой потому, что закончил свой проект, который нуждался в одобрении джона.

Along with the improvement of the telegraph in the XIX century, a telephone appeared. In the early 60s of the XIX century. Flight has designed a telephone set, which has not received any practical application. Further development of the phone is connected with the names of American inventors I. Gray and A.G. Bella.
Later, Bell demonstrated the developed by him electromagnetic telephone, which served as a transmitter and receiver. Apparatus interested in the business community, which helped the inventor to establish "Bell Telephone Company."
Many inventors worked on the improvement of the phone (V.Siemens, Ader, Gover, Shtaker, Dolbir, etc.). Soon Edison designed another type of telephone (1878). Edison provided the transmission of sound over a considerable distance.
In the 20-ies of the XX century, the first automatic telephone exchanges were installed.
In 1973 the company "Motorola" appeared. The first phone worked without recharging no more than 20 minutes and the size was similar to a brick and weighed 794 grams!

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