下图是我国的GDP（国内生产总值）中第一产业、第二产业、第三产业比重的变化情况。据此可以推论出我国（ ）
It will make ______big difference if this experiment becomes ______ success.
By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.
As is reported, it is 100 years______Qinghua University was founded.
He had his camera ready____ he saw something that would make a good picture.
They were busy ________ an experiment when I came.
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