PASSIVE VOICE

Endangered species _______by the World Wildlife Fund.

• are protected
• would protect
• be protected
• will protect

Unless we can find new sources of energy, our life will certainly _________.

• be affecting
• affected
• be affected
• affect

During that era, the powers and uses of reason ________ .

• has stressed
• were stressing
• were stressed
• stressed

The World Health Organization _________in 1948 in order to carry out medical research and improve international health care.

• was established
• had been established
• established
• had established

This tree _________by our grandfather over 40 years ago.

• grew
• has grown
• is grown
• was grown

Most of the earth's surface ______by water.

• have covered
• is covering
• is covered
• are covered

Children should be ________to realize their full potential.

• encouraging
• discouraging
• encouraged
• discouraged

“What's that thing?” “A fax. It's a machine by which ______over the telephone line.”

• written messages can be sent
• written messages can send them
• can send written messages
• can be sent written messages

“Is attendance important in this class?” “No, but in the last class it _____________very seriously.”

• has taken
• has been taken
• was taken
• was taking

The fire __________to have started in the furnace under the house.

• is believed
• that is believed
• they believe
• believe