The girl arranged to have piano lessons at the training centre with her sister______ she would stay for an hour.
If you ______ Mary, ask her to come and see me.
The machine is so advanced that it will start ______ you press the button.
What _______ the doctors most was that they could not find the cause of the strange disease.
It is ________ that Arthur gave back the money he found.
They have ______ a plan for reducing the budget deficit(财政赤字), which is quite practical.