******强调指出：要有腐必反、有贪必肃，要坚持“老虎”“苍蝇”一起打，加强对权力的制约和监督，把权力关进制度的笼子里，形成不敢腐的惩戒机制、不能腐的防范机制、不易腐的保障机制。下列关于对权力的制约和监督的说法正确的是（   ）

①权力是否接受制约和监督是区分有权威与无权威政府的主要标志

②坚持用制度管权、管事、管人是权力正确运行的重要保证

③有效制约和监督权力的关键是深化行政体制改革

④要发挥人民民主对权力的制约和监督

    Last Sunday，we had a class trip to enjoy____．Our head teacher took us to the____for a picnic．When we arrived there at 9：00 am by bus，we heard a big sound．It was made by the wind and the waves(海浪)．It sounded like they were playing wonderful symphony(交响乐)．

    Right away，we sat down and started to enjoy our picnic．We told jokes，sang and played games while ____sandwiches，chocolate and other snacks．In the afternoon，some students chased(追逐)each other in the____and swam for fun．Alice and I attempted to catch____in the water．Some students helped the cleaners____up the rubbish．Others played cards and chess．Everyone looked extremely____．

    At 4：30 pm，we had to go back to school，____we wanted to spend some more time on the beach. Just then, I found a blue hair band on the sand．"I think Alice dropped it" Sam said， "because she likes the____color．"But I thought it____belong to her because I saw her wearing a yellow one．At last, we knew it was Cindy's．We went back to school at 5：45 pm．The picnic came to an end．but we'll always remember the good time we had．