––Are you _______ “Planting online vegetables”? ––No, I think it’s a waste of time.
The old man lives ____ but he doesn’t feel ____.
Li Lei isn’t ____ Liu Ming.
Please be quick, or we will have no time ____ have lunch.
—Mom, my classmates invited me ____ a field trip. May I go with them? —OK.
On my way ____ home, I lost a ticket ____ Titanic.