【山东省东营市2015年中考英语试题】We can't make a sandwich without ?
I don’t know his ______, so I can’t write to him.
—Linda, ______ do people in Thailand celebrate the Water Festival? —They throw water at each other.
Peter likes to improve his health ______ doing sports every day.
______ mooncake on the plate looks delicious. I want to eat ______.
—-Would you please help me to take these books downstairs? —-_______ .