The students each _______________their own e-mail address.

Twenty miles _________a long way to cover.

The number of people invited to the party       200 but a number of them         ___absent for different reasons. 

While a huge amount of money ___been spent stopping pollution , large quantities of water_    _still heavily polluted．

The factory used 65 percent of the raw materials, the rest of which _____ saved for the other purpose.