Mr.and Mrs.Miller lived with a pet dog,Rita.They started a trip with Rita last November.On the seventh day of the trip,Mr.and Mrs.Miller were playing happily by a river when a heavy rain suddenly （突然地）came.At that time the Millers were trying hard to keep themselves away from the rain water with the umbrellas,they forgot about Rita.A few minutes later,they found Rita was lost. "We looked for her carefully for over an hour but we didn\’t find her. " Mrs.Miller told BBC News.We thought if she fell into the river,she would be gone because of the big waves. " The couple were worried if she had died in the water.
Mr.and Mrs.Miller kept sad on their way home because they lost their favorite pet.But four months later,they got some surprising news - The police found Rita in the park near the river.After the heavy rain,she was wet and she ran to a room in the park.A park worker found Rita and kept her.He thought that she was a wild （野生的）dog because she did not let people come close to her.However,when Mr.and Mrs.Miller came to pick her up,Rita knew who they were at once. "After I called her name,she jumped up and ran to me," Mrs.Miller said.
Rita is all right at home now,relaxing by the pool.But Mrs.Miller is still not sure what her dog went through.

根据短文内容,回答下列问题.
（1）When did Mr.and Mrs.Miller start a trip?
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（2）How long did Mr.and Mrs Miller look for Rita?
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（3）How did they feel when the Millers found their dog was lost?
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（4）Where did the police find Rita four months later?
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（5）Why did the park worker think Rita was a wild dog?
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