Lanzhou is the only capital city that the Yellow River, the second ________ river in China, passes through.。
---Hello! Can I speak to the headmaster, please?--- .
---Would you like to visit Taiwan?--- .
---Shall we go for a picnic in the park this Saturday?---Oh, that good.
There are_____ days in a year.
I have ____ friends and we chat with each other _____.