There’s a regular air-service ________ those two cities.: ответ на тест 874346 - Английский язык

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In the USA there are three levels of organization of medical service: the private doctor, the medical institution or hospital and the United State Public Health Service.
The average American has a doctor of his own, whom he calls his ‘family doctor’. The doctor gives the patient regular examinations, vaccinations and medical advice. This doctor receives pay directly from the patient.
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How many levels of organization of medical service are there in the USA?

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In the USA there are three levels of organization of medical service: the private doctor, the medical institution or hospital and the United State Public Health Service.
The average American has a doctor of his own, whom he calls his ‘family doctor’. The doctor gives the patient regular examinations, vaccinations and medical advice. This doctor receives pay directly from the patient.
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How many levels of organization of medical service are there in the USA?

I’ll never forgive you ________ you tell this to anybody.

I wouldn’t worry ________ I’m not bothered.

Choose an author ________ you choose a friend.

The guests had arrived _________ the rain began to fall.