_______________ is harmful to tress and forests as it contains a high level of acid in the form of water vapour.
A. oil spill
B. fossil fuels
C. toxic waste
D. acid rain
Select your answer:

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Vocabulary › ViewChelsea bought a shiny, deep blue binder for English class.
This sentence illustrates the following comma rule:
A. A comma is used to separate two or more adjectives modifying a noun
B. A comma is used before a coordinating conjunction in a compound sentence
C. A comma is used to set off an appositive from the rest of the sentence
D. A comma is used after a dependent clause when the clause begins a sentence
Modal Verbs › View
If there is fuel shortage, solar energy ____.
A. has to develop
B. will have to be developed
C. will have to develop
D. had to be developed
