By the year 2015, the number of women dying in childbirth is hoped to be reduced byA．2／3.B

The negotiations which ______ the signing of the treaty took place over a number of years.

The number of these families has increased ______ 40 percent in the past ten years.

The number of books in this library has been increasing considerably in the past two years

The number of these families has increased by 40 percent in the past ten years.A.在过

（), the number of private cars will increase sharply in the coming couple of years.A.

______recent report stated that the number of Spanish speakers in the U.S .would be higher than the number of English speaker by_____ year 2091.