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

Can you please tell me some information_____to the job?
A.that indicates
B.that are relating
C.that relate
D.relating

A large hydroelectric __________was built on the River Danube.
A.power
B.dam
C.bank
D.wall

_________ take the train instead of the bus? It's faster.
A.How about
B.Let's
C.Why don't
D.Why not