Why did he___ that the man we met on the bridge was his father? —God knows!

In Copenhagen Climate Conference，rich countries promised to________a fund of $100 billion a year by 2020 to help developing countries.[ ]

The sun rose, as it always ___, in a clear sky.

Don’t ______ until the bus stops. Or it’s too dangerous.

In 1938, Hitler _________ war against Poland, which started the Second World War.