The secretary had no more letters（）; she began to put all the letters in envelopes.

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• Letters, to some degree, is like a small piece of history that can be read more than once, savored and treasureD.
• The acronym of MOOC is made up of the first letters of（）.
• The “Three Letters” in Chinese traditional wedding include the（）, Gift Letter and Wedding Letter.
• When writing business letters, being concise means （）。
• When writing business letters, we should （）。