Though many extra planes and trains are used to carry passengers, traffic tools are still ______needed during “May Day” holidays.
Is this the hotel ________ you stayed the first time you were here?
Please ask ________ not to skate on the thin ice.It’s very dangerous.
Jack, you’ve done your homework, ________ you?
When I got up that morning, I found ________ elephant standing by the window.
The sight, hearing and other senses of wild animals are much better than of a human. A that B those C which D what