Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
He was so careless that he left _____the door ____.
____ many times, I could not remember her telephone number.
Mr. Johnson insisted that he _____ his debts, but nobody believed him.
If only I _____ a few days ago!Then I wouldn’t have been feeling so worried now.
_____ money, the man was very rich, but he was not happy at all.