__________knowledge comes from practice is known to all.
Every time he had a chance , he would talk about the great difficulty he had in the new country .
---- Amazing ! You wear slippers at work . ---- Don’t you know it’s a fashion ?
---- busy schoolwork , the children also have to take arts , music and sports classes in their free time . ---- I wonder what they will become .
We hurried all the way to the airport , only that the flight had been called off because of the foggy weather .
in writing a lecture speech on AIDS prevention , she has no time to attend to her sick mother .