By the time of last year, she ______ the piano for five years.
Jenny and Sally are_______.They come from _______.
When I walked past her room, she_______ an English song.
- He________ if he is free.
—What was Tom doing _______ it was raining? —He was doing his homework in the bedroom.
Some scientists believe that theremore robots in the future. A will have B. will has C. will beD. Are