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. 小题1: . “Why do you stand here, little dog?” he asks. 小题2:. The little dog looks at him. “Bow-wow-wow!” he barks again.小题3: “Come here, Frank.” He says. “A dog wants to tell us something.” Ten minutes later, Frank arrives. 小题4: . They see only a bone（骨头）.“This is what the dog wants to tell us.” says Frank. 小题5: . 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.