It is no longer a question now man can land on the moon. A.that B.if C whether D what
—Never _______ in line to get on a bus. —Is it not until you mention me _______ I know of it?
Hardly _______ to sleep when _______ the door.
Never before in China _______ for the unemployed.
_______ was only then I reread his theory recentlyI began to appreciate their value.
—We have to stop talking here outside.Listen, _______! —Hurry up, or well be late.