Where is your mother?— She _______ to Sichuan on business. She has ______ there four times recently.

______ is reported, a new town has been built on the ruins left by the big earthquake．

These broken pieces of plates don’t fit together, they ___________ parts of different ones.

China a lot in the ten years.

People who have regular physical exercise seldom catch a disease like H1N1 Flu, ______?