70. ______ successful launch of China’s first lunar orbit “Chang’e-1” has sent _____ waves of excitement across the country.
— It _______ be Mr.Johnson who is in the office. — No, it _______ be him.I saw him off at the airport half an hour ago.
--Was the test hard? --The test was so hard that he ________ failed.
The computer is ________ to be one of the greatest inventions of the 20th century.
The seller would sell the shirt for ten yuan, but the customer ________ eight yuan.
Hardly _____ when the train suddenly pulled away.