—What are you busy with ? —The conference _______ in our city next week.
Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.
We must apply what we have learned to our daily work because in no case_____ from practice.
Mrs. White found her husband surrounded by letters and papers and_______ very worried.
----What are you busy with? ---- The conference_______ in our city next week.
_______ of danger in the street at night, she had to go home with a friend_______ her.