I remember...................... the letter some time ago but I can't remember exactly when.
A.to post
B.posted
C.posting
D.post

Error Identification.
Habitat fragmentation (A) have caused (B) plant and animal species (C) in the remaining islands of habitat to lose contact with (D) others of their own kind.
A.fragmentation
B.have caused
C.species
D.with

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
The Bali Tiger was declared extinct in 1937 due to hunting and habitat loss.
A.reserve
B.generation
C.natural environment
D.diversity

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Being listed as an endangered species can have negative effect since it could make a species more desirable for collectors and poachers.
A.awareness
B.preservation
C.support
D.impact

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Probability of extinction depends _______ both the population size and fine details of the population demography.
A.on
B.in
C.from
D.for

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
Many modern medicines are derived _______ plants and animals.
A.on
B.for
C.from
D.in

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
A / an _______ species is a population of an organism which is at risk of becoming extinct.
A.dangerous
B.endanger
C.endangered
D.endangerment

Choose the best answer to complete each unfinished sentence, substitutes the underlined part, or has a close meaning to the original one.
_______ is a branch of Natural Science, and is the study of living organisms and how they interact with their environment.
A.Biology
B.Biological
C.Biologist
D.Biologically

Choose the word which is stressed differently from the rest.
A.government
B.agency
C.benefit
D.diversity

Choose the word which is stressed differently from the rest.
A.temperature
B.serious
C.awareness
D.chemical