Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.
A．producing B．having been produced
C．to be produced D．produced
We must apply what we have learned to our daily work because in no case_____ from practice.
A．should theory separate B．theory should be separated
C．theory should separate D．should theory be separated
Mrs. White found her husband surrounded by letters and papers and_______ very worried.
A．look B．looked C．looking D．to look
----What are you busy with?
---- The conference_______ in our city next week.
A．held B．to be held C．be holding D．will be held
_______ of danger in the street at night, she had to go home with a friend_______ her.
A．Warned; accompanied B．Having warned; accompanying
C．Warning; accompanying D．Having been warned; accompanying
On July 5, violent crimes of beating, looting and burning in Urumqi of Xinjiang broke out,______ 156 innocent people and with more than 1080_______.
A．killed; injured B．killing; injured C．killed; injuring D．killing; injuring
