Great efforts to increase agricultural production must be made if food shortage _____ avoided.
265. Which of the following does not belong to the same category?
264. The invention of the coal-burning_______engine revolutionized industrial production in the 18th century and opened the way to the development of mechanized transport by rail and sea.
263. The bank is equipped with new alarm _____. We can say it’s safe and reliable completely.
262. Please write me a 200-300-word_____ of this long report to read.
261. It took Susan weeks to regain her _________ after a bad _________.