------What's the matter with Tim? ------Oh, Tim's cell phone was left in a taxi accidentally, never ________ again.
I’m afraid this is the best way ______ we can think of ______ you.
Reading books is very important for developing the students’ understanding of the world, _______?
He sat on the sofa, with his arms ________ and eyes _______ on TV.
_____ you make a promise, you should keep it.
Every time ______ they met, they would talk several hours together about the persons and things _______ they remembered in the middle school.