Last night a tornado swept through Rockville. It everything in its path.
A.was destroy
B.was being destroyed
C.destroyed
D.had been destroyed

The new computer system next month.
A.is being installed by people
B.is be installed
C.is being installed
D.is been installed

Why did Tom keep making jokes, about me? I don't enjoy__________.
A.be laughed at
B.to be laughed a
C.laughing at
D.being laughed at

Many reliable methods of storing information when computers arrived.
A.tend forgotten
B.tend to forget
C.tend to be forgotten
D.tend being forgotten

Erosion, which washes (A) away valuable topsoil, can prevent (B) by (C) planting trees and grass. (D)
A.washes
B.can prevent
C.by
D.grass

It is estimated (A) that much of (B) a teenager's time is spending (C) chatting on the Internet.
A.is estimated
B.much of
C.spending
D.chatting

Tom: “Do you know where Barb is?” Mary: "Strange ______sound, she is in South Africa.”
A.may it
B.as it may
C.like it may
D.does it

Half the world's rain forests have already been ___________.
A.endangered
B.eroded
C.found
D.destroyed

Endangered animals should be bred in _______ areas.
A.conservative
B.conservable
C.conservation
D.conservance

Acid rain has caused severe _______ on the hillside.
A.erosion
B.pollution
C.destruction
D.floods