1.The invention of steam engine in the 19th century was such a ……………..in the history of science and technology. ( break )
2. The scientists have conducted three …………tests so far this month. (try)
3. All the findings of this research must be kept …………….. ( confident)
4. ……………..advances have changed people’s life both positively and negatively. (technology)
5. The …….of vaccine has remained one of the most important events in the medical field. (discover)
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