将代表正确选项的字母填入空白处，使文章语意连贯（共5小题，每小题1分，共5分）。
A little dog stands near an old well(井). He stands there all morning. “wow-wow!” the little dog barks(吠叫). Bob hears him all the morning.   . “Why do you stand here, little dog?” he asks. . The little dog looks at him. “Bow-wow-wow!” he barks again.   “Come here, Frank.” He says. “A dog wants to tell us something.” Ten minutes later, Frank arrives.    . They see only a bone（骨头）.“This is what the dog wants to tell us.” says Frank.     . The dog is very happy and runs away.

A．Bob calls his brother Frank.

B．Bob goes into the house.

C．Then Frank gives the dog a bone.

D．At last Bob goes to the well.

E. Bob says to the dog.
F. “And what are you barking at?”
G. They look down into the well.