6.4.7.1 Fill in with it and there tocomplete the summary of the story.The Darling children often dreamt of theNeverland. 1) is a magical placewith lagoons and forests. One day, 2) was a noise at their window.3) was Peter Pan! Peter Pantold Wendy that 4) are boys inthe Neverland that have no mothers. Peterwanted Wendy to become their mother. Petertook some fairy dust, blew 5) on Wendy, John and Michael, and they all flewaway.​

Первое shall, потому что в первом лице в будущем времени при предложении что-либо сделать или  как-либо используется именно shall, а не will.

Конструкция  be going to V  используется для намерения сделать что-либо в будущем: "Я собираюсь навестить брата в больнице". Вариант b не подходит грамматически, а вариант c по смыслу.

В третьем используется длительное время для обозначения действия, которое длилось определённый промежуток времени, и во время этого промежутка произошло второе действие, обозначенное временем Past Simple:
i WAS WATCHING tv when my mother CAME.
i WAS PREPARING dinner when the light GOT OFF.
Таким образом описываются действия, которые происходили определённый промежуток времени и внезапно прерывались другим, одномоментным, действием. Надеюсь, всё понятно. :)

Probably, archeologists were shocked when they found during the excavation of huge dinosaur bones. We now know that many reptiles are harmless animals of gigantic proportions who lived peacefully in the woods, eating grass. Some dinosaurs were huge, with an entire tennis court, and the other - a little like chicken. In some skin was smooth, while others - covered with scales, and he and all the horny shell that protects the body. In addition, some dinosaurs had horns or spikes. We know of about 600 varieties of dinosaurs. Dinosaurs lived on almost all continents of the Earth. But most of all evidence of their existence found in the Americas and Asia. English scientist Richard Owen (1804 - 1892) found a large number of huge bones. The beasts, skeletons he discovered he introduced very scary, and he called them "terrible lizards" or dinosaurs. Since they are called. It is believed that dinosaurs lived in the Mesozoic (ie average) age. The Mesozoic era began 225 million years ago and ended 65 million years ago. During this period, change the size of the continental part of the Earth and the continents were formed.

Это самое короткое из всех!