1．—Would you tell me you want your tea , with sugar or milk ?
— Sugar , please .
A．whether B．when C．what D．how
2．The county, ________ in the north of Shanxi, has a history of more than 1,400 years.
A. located B. to be located C. being located D. locating
3．Scientists have made a major ____ in cancer research.
A. break-in B. breakthrough
C. breakup D. breakdown
