Experts said it was that Malaysia Airlines Flight 370(马航370) had changed course and turned back toward Kuala Lumpur(吉隆坡).
The whole building _____ burned down, but the heavy rain _____.
Messages ______ be changed from sound into electricity before they ______ be sent by radio.
He _____ his parents that he has failed in the exam.
—The poor people lived near the highway.—_____ very noisy.
As is natural, a man as old as he ______ be very forgetful.