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小杨同学编写了一个VB程序用于学校里7选3选课情况统计。该程序主要功能有：1．点击“生成选课组合”按钮 Commandl，生成35种选课组合；2．点击“统计选课情况”按钮 Command2，统计出各种组合的选课人数；运行界面如下图。实现上述功能的VB程序如下，请回答下列问题：

（1）分析程序代码，如图里“选课组合”序号为30的组合名称为：___________________。
（2）请在划线处填入合适的代码。请回答下列问题：
Dim zh(1 To 16) As String, zrs As Integer
Dim xk(1 To1000) As String'存放同学的选课科目组合，已知学生人数少于1000人
Dim zh2(1 To 35) As String'存放35种选课科目组合
Dim rstj(1 To 35) As Integer'存放各种选课组合选课人数
Private Sub Form_ Load()
‘本过程从数据库中读取学生的选课情况数据，存放在数组xk中，学生的总人数存放在变量zrs。’代码略
End Sub
Private Sub Command l_ Click( )
Dim i As Integer,j As Integer, m As Integer, n As Integer, k As Integer
Dim km(1 To 7)As String
Listl.Clear
List1. AddIton“序号”+“” +“组合名称”
km(1)= “物”:km(2)= “化”:km(3)= “生”km(4)= “政”
km(5)= “史”km(6)= “地”:km(7)= “技”
m= 1
For i= 1 To 5
For k= i+1 To 6

zh(m)=km(i)+ km(k)

m= m+ 1

Next k
Next i
j= 3:n= 1:y= j
For i= 1 To m

For k= y To 7

zh2(n)=___________________________________
If n< = 9 Then
Listl. AddItem n &""&"         "& zh2(n)
Else
Listl. AddItem n &"  "& zh2(n)
End If
n= n+ 1

Next k

y= y+ 1

If y=8 Then

j= ___________________________  :y= j

    End If
Next i
End sub
Private Sub Command2_ Click( )
Dim i As Integer

List2. Clear

List2. Additon"组合名称"+""+"选课人数”

For i= 1 To 35

rstj(i)=_____________________________

List2 AddItem zh2(i)+"         "+ Str (rstj (i))
Next i
End Sub
Function tj (zhmc As String) As Integer'统计某种选课组合的选课人数
Dim i As Integer, rs As Integer
rs= 0
For i= I To zrs

If zhmc = xk(i) Then

rs= rs+ 1

End If

Next i
tj= rs
End Function