I listened carefully to his long boring speech, but could not        what he was talking about.  

—Have you read book called Waiting for Anya? —Who _______ it?

The boys followed the marks that they ________, until finally they found their way back to the campsite.

Now the world’s attention ________ the stock markets，as they have a great influence on the world’s economy.

The past two years ______a sharp rise in oil price, which adds to the burden of auto transportation industry.