The original chair was the result of years of experiments. The inventor wanted to produce a chair that could be mass­produced and was inexpensive, but it was only after many trials that he finally succeeded in __3__ (make) one. The chair he invented was probably the first one to be both attractive and inexpensive enough for anyone to buy. Millions of chairs of this type have been bought since the first one went on sale in __4__ 1930s. All sorts of people, some famous, some ordinary, have sat on the chair since the original was invented.

　　There are several __5__ (reason) for the chair's enduring popularity. It is great to sit on, and it __6__ (look) good; the basic design is still fresh and contemporary. Also, this type of chair seems to improve as it gets older. The glue, __7__ holds the chair together, loosens over time, making the chair even more comfortable __8__ (sit) on. A further reason is that the chair is cleverly designed with only a few pieces of wood, so the chair parts can __9__ (send) anywhere and put together __10__ (easy)．

　　It is no wonder this type of chair has remained so popular. Even today, furniture designers are still trying to create equally successful designs.

　　1．on/in　此处是省略引导词的定语从句，先行词是“the chairs”，在定语从句中作不及物动词“sit”的宾语，空格处缺少介词。坐在椅上要用介词on/in。

　　2．known　被修饰词“one very simple and elegantly designed chair”与动词know之间为被动关系，所以用过去分词known作定语。

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