Bob fell over because he ran down the hill.

The thunder roared ,so the hobbits .

Bilbo slept in a cave as the goblins attacked .

Gandalf strode into a rabbit whole as the cart came to a wheezing halt .

Jim was interested in the idea ,so he rang his friend.

Owls are nocturnal ,and this means they are active in the night because they have excellent eyesight.