5．Han Mei was cooking dinner _________his father was listening to music．

B 卷

4.________the twins were watching TV somehody knocked on the door．

3．_______the teacher came in，we were talking．

2．The boy was walking down the street ________the UF0 arrived．　　

1．________ the girl was shopping，the alien got out．

5.　　　　 I ________ (fly) a kite when it began to rain.

4.　　　　 Do you find it easy ________ (ride) a bike.

3.　　　　 What ________ they ________ (do) at this time yesterday?

2.　　　　 The woman ________ (finish) cleaning the house just now.

1.　　　　 He usually ________ (read) a newspaper after supper.