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某小卖部商品相关数据分别存放在相应的数据表中，如图 1 和图 2 所示。
     

图1                                   图2

编写“商品销售统计”程序功能如下：窗体加载时从数据库中读取商品的相关数据，对各商品类别总销量及名次进行统计，结果在列表框 List1 中显示；单击“查询”按钮 Command1，按商品类别编号从小到大排列，同一类别商品按销量从大到小排序，在列表框 List2 中显示。程序运行界面如图3所示。

图3
（1）阅读程序可知，gtype(b(3))的初始值为__________。
（2）请在划线处填入合适的代码。
Dim a(1 To 2000) As Integer, b(1 To 2000) As Integer, s(1 To 2000) As Integer
Dim gid(1 To 100) As Integer, t(1 To 2000) As Integer
Dim c(1 To 2000) As String, gtype(1 To 100) As String
Dim ts(1 To 100) As Integer '数组 ts 存储每个类别商品总销量
Dim k(1 To 2000) As Integer '数组 k 存储每个类别商品总数
Dim m As Integer, n As Integer
Private Sub Form_Load()
'从数据库读取 m 条记录中类别编号、商品类别数据分别存储在数组 gid、gtype 中
'从数据库读取n 条记录中类别编号、商品名称、商品销量数据分别存储在数组 b、c、s中，代码略

For i = 1 To n    '统计各类别商品总销量及商品总数

______________

k(b(i)) = k(b(i)) + 1

Next i

For i = 1 To m         '计算各类别商品总销量的名次

p = 0

For j = 1 To m

If ts(i) < ts(j) Then p = p + 1

mc(i) = p + 1

Next j

Next i

List1.AddItem "类别 销量 名次"

For i = 1 To m

List1.AddItem gtype(i) + "  " + Str(ts(i)) + "   " + Str(mc(i))

Next i

End Sub
Private Sub Command1_Click()
Dim i As Integer, j As Integer, pos As Integer, tmp As Integer, p As Integer
p = 1

For i = 1 To m

a(i) = p

p = p + k(i)

Next i

For i = 1 To n

 p = b(i)

t(a(p)) = i

a(p) = a(p) + 1

Next i

pos = 1

For i = 1 To m    '对各类别商品按商品销量进行排序

For j = pos To pos + k(i) - 2

__________________

tmp =t(j): t(j) = t(p): t(p) = tmp

Next j

pos = pos + k(i)

Next i

List2.AddItem "类别    商品    商品销量"
For i = 1 To n
List2.AddItem  ___________ + " " + geshi(c(t(i))) + "  " +Str(s(t(i)))
Next i
End Sub
Function f(head As Integer, tail As Integer) As Integer

Dim i As Integer, p As Integer

p = head - 1

For i = head To tail

If s(t(i)) > s(t(p)) Then p = i

Next i

f = p

End Function

Function geshi(s As String) As String '格式输出，代码略

End Function