6.--- Is there any possible way to help them get rid of such a bad habit? --- To tell the truth, it’s very hard. But we teachers________on this problem.
It is becoming more and more difficult to_______the problems of traffic in some big cities of our country.
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.