过点（1，3）作直线l，若经过点（a，0）和（0，b），且a∈N^*，b∈N^*，则可作出的l的条数为（　　）

A．1

B．2

C．3

D．4

根据句意，在答题卡标有题号的横线上，写出括号内所给单词的适当形式。

小题1:Who do you want to celebrate ___________ (father) Day with ?

小题2:The leader is __________ （satisfy）with my design than yours .

小题3:Rub this oil into your skin and your headache will soon      (appear)! Have a try!

小题4:The police are searching for the __________ （thief）. Because they have stolen much money .