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有一组正整数，要求供对其中的素数进行升序排序。排序后素数在前，非素数在后。排序示例如下。

Const n = 8
Dim a(1 To n) As Integer
Private Sub Command1_Click()
Dim i As Integer, j As Integer, k As Integer, t As Integer
Dim flag As Boolean
'读取一组正整数，存储在数组 a 中，代码略
For i = 1 To n - 1
k = 1                               ‘①
If IsPrime(a(k)) Then flag = True
Else flag = False
For j = i + 1 To n

If IsPrime(a(j)) Then

If a(j) < a(k) Then               ‘②
k = j
flag = True
End If

End If

Next j
If k <> i Then

t = a(k): a(k) = a(i): a(i) = t

End If
If Not flag Then Exit For 'Exit For 表示退出循环
Next i
'依次输出排序后的数据。代码略
End Sub
Function IsPrime(m As Integer) As Boolean
'本函数判断 m 是否是素数：是素数返回值为 True，不是素数返回值为 False'代码略
End Function
划线处代码有误，请将正确的代码填到横线上。
①_________________________
②_________________________