1 . More than a new invention like 3D printers has been used to make ______(替代品) hearts and bone parts in the past few years.(根据汉语提示单词拼写)

2 . With the teacher’s________ (同意), the boy hurried out to the ground floor to pick up his book. (所给词的适当形式填空)

3 . Last year the number of students who graduated with a driving license reached 200,000，an __________（平均）of 40,000 per year．

5 . In other words, we had better take __________(娱乐) to rest after work. (根据汉语提示单词拼写)

6 . African runners swept all the_________ （奖牌）in the distance events. （根据汉语提示单词拼写）

7 . The company suffered a heavy_________（损失）as a result of the mistake. （根据汉语提示单词拼写）

8 . He used to play practical_________（玩笑）on all his friends and neighbors. （根据汉语提示单词拼写）

9 . We drove our car slowly in order to watch the lions in the nature_________（保护区）. （根据汉语提示单词拼写）

10 . What our headmaster said at the sports meeting made a strong i________ (印象) on us. (根据中英文提示填空）