Please call us when you ( )London 中间填什么?

Please call us when you ( )London 中间填什么? 括号内填什么When are you ()london()Paris? when you visit us __china ,please call me a,in b,to Please call me as soon as you ______ in London. Can you come 什么介词us 中间填什么介词? please call me when you alone. Please call me when you my help please call me when you ------ -------Beijing Please call me when you are in___ would you like ___ -- yes,please.中间应该填什么? Could you please (not open ) the window?中间填什么? Please write to us as soon as you ________ London.