—I telephoned him twice and I couldn’t get through to him. —The line might have been out of order, ?
It's important to learn how the whole system works. Sometimes, ________, it's the details that interest us the most.
For many people, paper is ________ better material, because ________ process for recycling paper seems much easier.
--- You won’t believe it. Sam. I have been chosen as an exchange student to China . --- Congratulations ! ___
We have a high regard for Mr. Black because he always tries to ________ his principles.
--- I saw your uncle take a taxi to the airport. Why didn’t you drive him there ? --- I ___. But my car ____.