He lost his ______and fell off his bicycle.

As the years passed, many _________—birthdays, awards, graduations—were marked with Dad’s flowers.

Please read the _____ on the bottle of the medicine carefully and pay attention to the amount and the time to take the medicine．

—Do you know what _____ influenza A (H1N1) has? —A high temperature, throat pain and so on.

It is a great ______ for us to be invited here to meet the great scientist face to face.