If I ______ about this computer program, a hage amountof time and energy would have been saved.

I don’t understand why you didn’t go to the lecture yesterday afternoon.—I’m so sorryBut I _________ my homework

.-Have you found the information about the famous people_________ you can use for the report-Not yet. I’ll search on the Internet.

To our surprise, not a single word ________ in the discussion last Friday. [ ]

SARS__________ in Hong Kong in the winter of 2002.