Const n = 15

Private Sub Command1_Click()

  Dim a(1 To n) As Integer  '数组a存放不同颜色袜子的数量，默认值为0

  Dim s As String, ch As String

  Dim c As Integer, i As Integer, t As Integer

    List1.Clear

    s = Text1.Text

    t = 0 ：c = 0 : i = 1

    Do While i <= Len(s)

        ch = Mid(s, i, 1)

        If ch >= "0" And ch <= "9" Then

            t = t * 10 + Val(ch)

        Else

            a(t) =   ①  

            t = 0

        End If

        i = i + 1

    Loop

    For i = 1 To n

        If   ②    Then List1.AddItem "落单袜子的颜色为" + Str(i)

        c =

    Next i

    Label1.Caption = "能配对的袜子有" + Str(c) + "双"

End Sub

请回答下列问题：

实现上述功能的VB程序如下，但加框处代码有错，请改正。

Const n = 10

Dim a（1 To n）As Integer

Private Sub Commandl_Click（）

Dim i As Integer，j As Integer，t As Integer

Dim bottom As Integer

'获取排序前数据依次存储在数组a中，并在文本框Text 1中显示。代码略

bottom = n

i = 1

Do While i<= bottom-1

  For j = bottom To i + 1 Step -1

      If  Then   ‘⑴

        t = a（j）： a（j）= a（j - 1）：a（j - 1）= t

      Elself a（j）= a（j - 1）Then    '相邻两个数据相等，进行剔除处理

           ‘⑵

        bottom = bottom -1

      End If

    Next j

    i = i+1

Loop

Text2.Text=＂＂

For i = 1 To bottom

  Text2.Text = Text2.Text+Str（a（i））

Next i

End Sub

⑴{#blank#}1{#/blank#} ⑵{#blank#}2{#/blank#}