--Do you know what caused the accident? --- No, not yet. The matter _____.
There is____thing as failure. Failure is just life trying to move us in another direction.
Yesterday afternoon, I ______ basketball with my classmates for two hours.
In my opinion, life in the twenty-first century is much easier than ___________.
The field research will take Joan and Paul about five months; it will be a long time _________ we meet them again.
— I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice. — Oh, it __________ my younger sister. She was in my room at that moment.