Fill in the blank with the appropriate words.

Making a Fish Pond

    At last year holiday I didn’t go ____(1).

    I just stay at home for the whole month. It was not too bad to spend the holiday at home because I had ____(2) to do. I did a small project building a small fishpond at home. 

    What I need is river sand, cement, and some tools. I ____(3) the middle space of my yard. After that, I made the design.

    Anyway, I would like to keep some koi fish at that fishpond, so that I had to make the ____(4) as well as I can. I preferred to choose the nature landscape as the model.

    I did it alone, day and night. I was so happy to do that.

    After two weeks, I ____(5) it. It was a small beautiful fishpond with nature landscape designed.

    ____(6) I put on it some koi fish, I fill the water and waited for about two weeks to make sure that the ____(7) was free from poison. 

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The appropriate word to fill in blank (6) is...