The pilot,(飞行员) whether ______ or on purpose, made the plane do a sharp turn.(急转弯)
She thought _______impossible to finish so much work in a day.
--- I’ve told her many times, and she still forgot about it! --- I understand. It’s true that she_______be very forgetful sometimes.
My mother made a promise _______I passed the examination, she would buy me an MP4.
_______ in the city for thirty years, the old man moved back to the countryside.
The woman scientist was so busy that she could hardly_______ time to her children.