_____________ a rise at the opening of the Russian stock market today, experts estimate the current situation as not very favorable.
A. however
B. because
C. although
D. despite
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An international committee issued a depressing forecast of how human beings and natural ecosystems will be influenced in the future, _____________the effects of global warming intensify.
A. as
B. however
C. besides
D. despite
It is easier to study animals and plants than human beings _____________ plant and animal behaviors can be controlled and monitored.
A. because
B. due to
C. however
D. thus
_____________ computers, ecologists have simulated communities containing various plants and animals.
According to
B. For
C. Since
D. By means of
_____________ children get older, their questions get harder to answer.
As
Because of
C. However
D. In case