I saw _____ penguin at the zoo.
A. a
B. an
C. some
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Conditional Sentences › ViewI would have visited you before if there _____ quite a lot of people in your house.
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The study of _________ and viruses help in creating better anti-biotics and developing pro-biotics as effective medications.
A. mutation
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Some kinds of bats eat many insects. (2) Some bats can eat up to 600 insects in one hour. (3) Bats are helpful to the environment, and they help us by eating insects.
Which of these sentences could BEST follow sentence 3 to enhance the meaning?
A. Bats are mammals
B. Bats eat 600 insects in one hour
C. Bats eat a lot.
D. Without bats, we would have too many insects.