初中英语状语从句单选题

---So you were in the supermarket __________ you heard a strange sound, right?
---That’s true. I ran out as quickly as possible. 

A．when

B．while

C．then

D．which

Teacher: Does anyone know 　　　 the famous writer was born?
Mei-ling: I know!  In Taitung, right?  Teacher: You got it!

A．how

B．when

C．where

D．whether

        we eat too much KFC, we may get fat.
A. If                              B. After                                                            C. Before