I know Mr Brown； we ＿＿＿＿＿＿ to each other at an international conference

Not until the train pulled into the station thathis suitcase was gone

I will appreciate it ______ you can change your plan a little bit to make it more workable.

When I knew that China had got her first Aircraft Carrier (航空母舰) , I felt excited and .

______ –I have been there three times.