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数组a 中存储的是两个数列交替排序的n个正整数，下标为奇数的数组元素都是奇数且为升序排列，下标为偶数的数组元素都是偶数且为降序排列。排序示例如下：

依据对分查找思想，设计一个在数组a中查找数据key的程序，实现该功能的VB程序如下，请回答下列问题：
（1）请在划线处填入合适的代码。
Const   n = 10
Dim a(1 To 10) As Integer
Private Sub Form_Load()
Dim i As Integer
Dim b(1 To 10) As Integer
For i = 1 To n
     b(i) = i
If i Mod 2 = 1 Then
            a(i) = b(i)
Else
            _____
       End If
Next i
For i = 1 To n
        Label1.Caption = Label1.Caption & "   " & a(i)
Next i
End Sub
Private Sub Search_Click()
Dim a(1 To 10) As Integer
Dim i As Integer, j As Integer, m As Integer, f As Boolean, key As Integer
key = Val(Text1.Text)
If_____       Then
        i = 1
Else
        i = 2
End If
j = n: f = False
Do While i <= j And Not f
       If key Mod 2 = 0 Then
          m = (i + j) \ 2 - (i + j) \ 2 Mod 2
       Else
          m =______
       End If
       If   key = a(m) Then
               f = True
ElseIf
Then
j = m - 2
Else
i = m + 2
End If
Loop
If   f   Then
       Label2.Caption = Str(m)
Else
        Label2.Caption = "不存在"
End If
End Sub
（2）程序加框处代码有错，请改正____。