Question 1
正确答案: 321000
Question 2
正确答案: vocabulary
Question 3
正确答案: podcast
Question 4
正确答案: smartphones
Question 5
正确答案: bilingual
Question 6
正确答案: playground
Question 7
正确答案: picture
Question 8
正确答案: grammar
Question 9
正确答案: identity
Question 10
正确答案: fluent