Is that man in a red T-shirt Mr. Smith—It______ be Mr Smith. He is on the way to London now．

The weather is too cold ____ March this year. —It was still ____when I came here years ago.

He ______ for Shanghai this Friday, and he wonders when the first train ______.

He has been working hard for 6 days，________a lack of concentration in the meeting.[ ]

long time, he hesitated whether heshould tell us ____ what had happened．