officially announced his retirement on September 18, 2014, ________ tennis for 26 years.

The SARS will _________ quickly if we don’t pay much attention to it.

On snowy days, you have to drive very _____ to avoid traffic accidents[ ]

______ you leave now—Yes, because I’m meeting my aunt at 7:00 thisevening.

No sooner _______ the competition _______ _______ an unexpected accident happened.