Questions 21 to 25 are based on the following passage:
Muggs was the worst of all my dogs. He always acted as if he thought I wasn’t one of the fami-ly. There was an advantage in being one of the family, for he didn’t bite the family as often as he bit strangers.
In his last years Muggs used to spend almost all his time outdoors. As a result the garbage man,the iceman and the laundryman wouldn’t come near the house. We had to drag the garbage down to the corner, take the laundry out and bring it back, and meet the iceman away from home.
After this had gone on for some time wi hit on a good idea for getting the dog into the house so that we could lock him up while others needed to come inside the house. Muggs was afraid of only one thing, thunder and lightning, It frightened him out of his senses. He would rush into the house and hide under a bed or in a clothes closet. So wi made a thunder machine out of a long narrow piece of iron with a wooden handle on one end. Mother would shake this with all her strength when she wanted Muggs into the house. I suppose it was the most complex system for running a household that was ever devised. It took a lot out of Mother.
21.If you were a member of the family, you had the “advantage” of (being bitten less often than strangers were by Muggs.)
22.The garbage man wouldn’t come near the house because(he was afraid of being bitten by Muggs.)
23Judging from the context, “we hit on a good idea” most probably means “(we suddenly thought of a good idea)”.
24.The thunder machine was made to (frighten Muggs into the house)
25.We learn from the passage that Muggs (caused a lot of trouble to the family).