How long do you think it will be _____ President Hu Jintao makes another visit to America?—It all depends[ ]

Yongchuan is one of ____ satellite cities in Chongqing.

Have we ________water?—Yes, ________. We’d better get some.

Only when your identity has been checked__________.

_ I went to the South Lake in Hanzhong, I was deeply impressed with its beautiful scenery.