28Vitamin D helps our bodies make a special chemical, and this special chemical, _______, affects our brains, making us feel happy

________ is it from the New Town to the old city centre—– About 30 minutes by underground.

When the earthquake, a destructive natural disaster, happened, ninety-nine coal miners were trappedin the coal mine _____the ruins, waiting _____[ ]

What would you like to eat—–I’m very hungry. _______ you can get. Just get it now.

n e-mail from Liu Xin, ___ said she was going abroad for further study.