“苟安者弱,拼搏者强;自强者昌,自弃者亡。”这句话告诉我们( )
--Would you like some tea, please? --Yes, and I prefer tea _______ some sugar.
--The man in a black suit _______ be our youth worker. -- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.
To find ___ better job, she decided to learn ___ second foreign language.
Beijing is one of the ____ in the world.
The skirt ____ she is wearing today was a birthday present from her mother.