Oil prices have risen________32 percent since last year，________a record $84.65 a barrel on Nov.9.

 Do you know the Three Gorges Dam is the largest hydro-electric dam ever_______?

It's clear that the thief was seen __ into the room that night.

The old man sat in front of the radio every evening, ______ his favorite program.

But later people developed a way of printing, _____rocks.