Whose shirt is this? — It _______ be Li Lei’s. It is too big for him.

He was admitted to a famous university，________ was obvious that his situation had gone beyond his parents’ expectations.

That day, we______ for the train station when Tom fell and hurt his legs badly.

The New Year concert provided ________ with a good platform to show our talent.

The sentence structure (结构) of “They painted the walls white.” is “_____”. [ ]