英语语法问题 Shanghai lies -the east of China and -the northeast o

英语语法问题 Shanghai lies _the east of China and _the northeast of Guangdong.(填to或in）Shanghai lies _the east of China and _the northeast of Guangdong.(填to或in）Peter says that the Whites are on holiday,but no one knows where they have _(填been或gone）Julie _ her good friends likes singing(填as well as或also或then）回答并解释。