[ Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous ]
I heard a knock at the front door so I ____ to answer it.
A. went
B. was going
C. had gone
D. had been going
Select your answer:
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Grammar › ViewWhich comma should not be in the sentence below?
On Saturday, July, 5, 2021, we will host a picnic.
A. Saturday, July 5
B. July, 5
C. July 5, 2021
D. 2021, we
Vocabulary & Grammar › View
_______________ 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