He is in China,为什么要加is

He is in China,为什么要加is ____now he is in China . The Yellow River is the second longest river in China为什么要加th china is a nice place [ to live ] in 为什么要加to He is ( )China. He is used to ____(live) in China.为什么,谢了 He is going to a teaching job in China为什么填look for,而不是find? _China is in _ east of Asia China 前为什么不加the? China is larger than any country in Africa,country为什么不加s where is tea produced in China?（这句话的produce为什么加d） In the music world,he is making < > heard in China. 请问he said he is from china 为什么?