1£®It ________ (snow)when he arrived at the station.

2£®As I was coming here£¬I ________ (meet) your brother.

3£®Great changes ________ (take) place in Beijing since it was liberated.

4£®I ________ (tell) you as soon as I know.

5£®We’ll wait until the doctor ________ (come)£®

6£®The telephone rang when I ________ (take) a bath.

7£®As he talked on£¬he ________ (get) more and more excited.

8£®They talked as they ________ (walk) along the river.

9£®He was punished only because he ________ (break)the law.

10£®As he was in a hurry£¬he ________ (leave)his bag at home.