完形填空。

    A shop owner closed his shop and went home. He was very 1  but just as he went to bed the telephone 2  . A man asked, "What time do you open your shop?"The shop owner was 3  about this phone call. He put down the receiver without answering and went  4 to bed. A few minutes   5  the telephone rang  6  and the man asked the  7  question. The shop owner became very   8   and he shouted, "You needn't ask me when I open the shop because l won’t let you  9. ""Oh, no. I don’t want to   10  in, "the mail said, "l want to go out. "

如图，△OA₁B₁在直角坐标系中，A₁（﹣1，0），B₁（0，2），点C₁与点A₁关于OB₁的对称．对△A₁B₁C₁进行图形变换，得到△C₁B₂C₂，使得B₂（3，2），C₂（5，0）；再进行第二次变换，得到△C₂B₃C₃，使得B₃（9，2 ），C₃（13，0 ）；第三次将△C₂B₃C₃变换成△C₃B₄C₄，B₄（21，2），C₄（29，0 ）…按照上面的规律，若对△A₁B₁C₁进行第四次次变换，得到△C₄B₅C₅，则C₅（ ____）．

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