—Mike, what were your parents doing at 8:00 last night?—My mother was reading________ my father was playing computer games.
I’ll go to visit my aunt in England ____ the summer holidays start.
My friend is coming to visit us.I’m looking forward ____ him.
The policeman doesn’t think teenagers ____ drive.
—Do you know who the pen ___? –Sorry,I don’t know.
The mobile phone has influenced people’s life a lot since it ____.