—He didn’t go to the lecture this morning.did he?—________,though he was not feeling very well.
-----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 ______.
— I’m sorry for losing your book . — ______________