1.We shouldn’t ignore the problems that e in our study.
答案:exist
2.I didn’t have enough money to buy a new bicycle,so I bought a s one.
答案:second-hand
3.He is such a g man—he’ll never be satisfied.
答案:greedy
4.The discovery of DNA was a major scientific a in last century.
答案:achievement
5.He spent several years in Paris,so he could speak French f .
答案:fluently
6.Not only was Edison intelligent,but he was h ,both of which contributed to his great success.
答案:hardworking
