----Which subject do you like better, math or physics? ---- I prefer _______ math ________ physics.
She was afraid of __________SARS because it was dangerous.
-----Who taught _________Japanese? ----I learned it by ______________.
Humans can’t live _______air.
---Oh, you have a headache and a cough. _______have you been like this? ---Three days.
I prefer_____ to ______.