.As reported in the essay by Prof. Brown, it is only in the most difficult circumstances ________ a man’s abilities are fully tested.
【原创】The three decades after the practice of the policy of reform and opening up has _____ great prosperity in most areas of China.
【原创】Mr Smith was _____ flight to New York _____ he remembered he had taken all the family's keys to the doors with him.
【原创】He knew the problem was serious and promised to look into it _____ he reached office.
【原创】Jane kept quiet about the accident _____ lose her job.
This kind of ancient book requires a great deal of .