Задания по грамматике и лексике. Once there were (ФИПИ)

Once there were four children whose names were Peter, Susan, Edmund and Lucy. This story happened to 
________THEY__________ when they had to leave their home city, 
London, during the war. 

They ________SEND __________ to the house of an old Professor who lived in the country, ten miles from the nearest railway 
station. 

He ________NOT/HAVE __________ a wife and he lived in a very large house with a housekeeper. 

He himself was a very old man with white hair which grew over most of his face as well as on his head. 
The children liked him almost atonce. Only Lucy, who was the _______YOUNG___________ of them, felt a little afraid of him. 

On their _______ONE___________ evening, after dinner, they said good night to the Professor and went upstairs. It was the largest house they had ever seen, so Peter suggested exploring it in the morning. 

When the next morning came, there was a steady rain falling. "I wish the weather _____BE____ more cheerful!" said Edmund. 

"Stop complaining, Ed," said Susan. "I think the weather 
_______IMPROVE___________ soon." 

"We were going to explore the house," Peter reminded them. He ______EAT ________ a sandwich at the moment and was absolutely happy with the whole situation. 

Everyone nodded and at that point their amazing adventures ______BEGIN____________.