英文缩写H1N1 的含义是_______________.硬黑 B. 光盘 C. 甲型流感 D. 乙型流感
—How long can I keep the books? —_____
—_____ is it today? —It’s Tuesday.
—It’s time _____ lunch. —OK. Let’s _____.
I don’t like living in the cities, because the cost of living is _______.
—_____ do you go to the zoo with your brother? —Three times a month.