Курсивом выделено то,что должно быть в пропусках.

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The first month is January.

The second month is February.

The third month is March.

The fourth month is April.

The fifth month is May.

The sixth month is June.

The seventh month is July.

The eighth month is August.

The ninth month is September.

The tenth month is October.

The eleventh month is November.

The twelfth month is December..