Topics: Vocabulary & Grammar
Chemical substances which are pumped into rivers and lakes by factories are known as ____________________.
A. oil spill
B. fossil fuels
C. toxic waste
D. acid rain
Select your answer:
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Grammar › ViewHe said he was sorry, yet he still seems very upset with me.
A. Simple
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You _________ spend so long on the computer.
A. should
B. shouldn’t
C. must
D. mustn’t