Headlines - Tradução em português

Newspaper headlines can be some of the hardest things for a non-native to understand, because they are often abbreviated to the maximum in order to fit copy to the space available. How would you translate to English the following that appeared in today's Estadão?

1. "Lula agora 'largou' o Sarney, diz líder do PSDB"
2. "Governo reajusta benefícios em 10%"
3. "Petrobrás quer ser única operadora"
4. "Crise provoca rombo de US$10 tri à economia"

Have fun!