Since David ________ downloaded a virus into his computer，he can not open the file now[ ]

itor-in chief asked me to write an article forhim, ______ about AIDS patients in China

Would you please thepaper for me and see if there are any obvious mistakes

Our earth is getting warmer and warmerIt is time for us to_____ the emission(排放) of CO2

Mo Yan’s books are very popular. People from different countries can read them ________ many languages.