填写合适的词。
____的舞蹈 ____地舞蹈
____的城市 ____地成长
____的目光 ____地问
-- Do you know something about China?
-- Yes. The number of people in China is about 1.4 billion.
I know you're busy these days, but you'd better ___________ off today's work till tomorrow.
下列一元二次方程中两根之和为2的是