I called you yesterday afternoon, but nobody answered.—Oh, I ___________ in the playground.

ry, sorry to have kept you wait.- It doesn’t matter, but I ________ you ________ later than me.

He is the only one of the people here who ____ how to operate the computer.

more forests being destroyed, hugequantities of good earth _________ each year.

It was only with the help of special device ______ the information.