________ you row a boat at the age of 10?  No, but now I ________.

一Shall we meet at the station at 8 am?—In fact, we _______. The train _______ until l0 a.m.

Curious about the world around him, my son__   __ask me endless questions when he was young．

You ______ to the meeting this afternoon if you have something important to do.

Students ___________ remain in their seats until all the papers have been collected.