He was _________down for several days after he heard the bad news .
—Why was Professor Johnson unhappy those days? —Can't you see it clearly? The only reason was that the theory he stuck to_____ wrong.
______ as the main reason for the recent world-wide economic problems is the fact that the US government would hardly accept.
The Apple Company had scarcely released i-Phone ______ it became one of the best-selling electronic products.
Electrolysis(电解)is the process ______ electric current is passed through a substance to cause a chemical charge.
So much ______ by the poem for the Wenchuan earthquake that he decided to participate in the re-construction of the damaged region.