The suspect has proved that he was at ______ place atthe time of the crime.

_______ the extreme levels of air pollution, city authorities have started to take measures to quickly reduce pollution levels and protect city dwellers.

Eddie has signed up for the speech contest and he practices ________ his speech every day.

________the Greens, who else went to theShanghai World Expo with you? [ ]

This was not an easy decision. ____, it is a decision that we feel is our duty.