1. ---What _____your mum______last night?
　　---She was doing some housework.
　　A.did;do    B.does;do    C.was;doing  D.were;doing
　　2. The children were_____ and____in the garden yesterday afternoo n.
　　A.singing;danced     B.sang;danced
　　C.singing;dancing     D.sing;dancing
　　3. That white rabbit was_______ in a tree and it was _______.
　　A. sitting; smiling   B. sat; smiled
　　C. siting; smiling   D. sit; smile