Could you help me please?

ILearnEnglish__
I have an English homework. They are a sentence and we must complete this sentence with one word.

The sencence is:
Could you close your window... , please?
The second letter of this word is L, and the last letter is D.

Have you an idea?
Updates:
15 d
This word contain 5 letters
Could you help me please?
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