when
                    - Could you tell me _____ the Sports Center? —The day after tomorrow, I think.
 - Do you know __________ in China tomorrow?—In the morning.
 - Betty is going to London. But I don’t know ________.
 - Do you know _____?-Next month.
 - Mr. Smith joined in different activities in Beijing. Do you know ___________?— Since 5 years ago.
 - My sister is on holiday in Hainan. —I wonder ____.
 - Can you tell me ______ ?—Yeaterday afternoon.
 - Excuse me , can you tell me?
 - Do you know _______ for Hainan last week?—Last Tuesday.
 - Who can tell me_______? —Every 15 minutes.