根据句意，用括号内所给单词的适当形式填空。

小题1:He is the __________(four) child of his family.

小题2:My father __________(teach) Chinese in a secondary school.

小题3:How many _________ (wait) are there in the big restaurant?

小题4:The schoolbags on the shelf belong to ________（they）.

小题5:The things in the shop are too expensive and there are few _________(shop) there.

假设有以下程序段：
n=0
For i==1 To 3
For j=-3 To 1
n=n+1
Next j
Next i
程序运行后n的值为( )。

A．3
B．4
C．12
D．15