实现上述功能的VB程序代码如下，但加框处代码有错，请改正。

Private Sub Command1_Click()

  Dim s As String, ch As String

  Dim ch2 As String, sum As Double

  Dim n As Integer, i As Integer

  s = Text1.Text

  n = Len(s)

  i = 1: sum = 0

  Do While                                    ＇①

    ch = Mid(s, i, 1)

    If ch >= "0" And ch <= "9" Then

      j = i

      ch2 = Mid(s, j, 1)

      Do While ch2 >= "0" And ch2 <= "9"

        j = j + 1

        ch2 = Mid(s, j, 1)

      Loop

      sum = sum + Val（ ）     ＇②

      i = j

    End If

    i = i + 1

  Loop

  Label3.Caption = Str(sum)

End Sub

①{#blank#}1{#/blank#} ②{#blank#}2{#/blank#} 

Dim i As Integer， a As Integer， b As Integer， c As Integer

Dim s As String

a = 0: b = 1: c = 0: i = 2

s = Str(a) + Str(b)

Do While c <= 10000 And i < 100

    a = b: b = c

    c = a + b

    s = s + Str(c)

    i = i + 1

Loop

Text1.Text = s

运行上面的程序，发现输出的数列不正确，应进行修改。以下修改正确的是（  ）