Fill in the blanks with the proper forms of given words.

I helped my mother to buy some beef and three____ (potato) for supper today.

"Belt and Road"（一带一路) are the two wings of developing Asia in the____ (twenty-one) century.

Please keep____ (silence) in the concert hall because people are enjoying Lang Lang's piano performance.

Candy ____ (lay) out the tea, fruit and snacks on the table and waited for the visitors.

.With the development of technology, mobile phones are ____ (wide) used these days.

珍的笔画顺序是：____

翻译下列句子

假如你有幸参加中央电视台“开心辞典”的竞赛活动，主持人王小丫给你出了这样一道题：他是欧洲人，他率领船队横渡大西洋，到达美洲的巴哈马群岛，开辟了欧洲通往美洲的航路。请回答，他是（　　）