________ you _______the Chinese Culture Festival in the Central Square？
Yes． It was really a great success.( ）
A．Are；attendingB．Will；attend
C．Do；attendD．Did；attend
Were you told ________to arrive at the train station？
Yes． The group leader said we would meet there at half past ten． （ ）
A．howB．whyC．whenD．where
Mum， I've signed for a big box by Future Express（快递）． What' s in it？
I'm not sure． It________ be a present from your brother． （ ）
A．mightB．mustC．shouldD．will
It has been much easier for me to go to work________ shared bikes appeared．
But they also caused plenty of problems．( )
A．sinceB．beforeC．unlessD．though
Who is the space scientist from Beijing？
The man______ white over there． He's of medium height.（ ）
A．withB．inC．orD．for