Due to the volcano eruptions in the Republic of Iceland, all the flights are delayed or cancelled, so the conference has to be ________.
The house with the ground is valued ____ three thousand yuan, but I bought it ____ only one thousand yuan.
—Does David often come to school ____ bus? —Yes, but sometimes he comes ____ his father’s car.
Mr. Johnson starts to work very early in the morning and goes on working until late in the afternoon ________a break at midday.
____you have done might do harm____other people.
The two ladies are ________ the same age, but there seems to be ten years ________ them.