Many nations have promised to reduce greenhouse gas emissions, but are falling short of the _______ reduction of 25 to 40 percent of 1990 levels.
I lost your address, otherwise I____you long before.
Very loud noise_____make people ill or drive them mad.
_____he come, the problem would be settled.
Without your help, I ____the exam last term.
The young man insisted that he_____nothing wrong and___free.