Sometimes smiles around the world ______ be false, hiding other feelings like anger, fear or worry.
Only ______ a human being.
---Why didn’t you tell me the truth about his illness? ---___________, I knew nothing about it at that time.
---I am afraid that I have to trouble you with this question. ---___________.
--How long are you staying ? -- I don’t know . ______.
The Olympic Games are held _____.