[ Grammar ]
In particular, researchers in this area have studied animals and insects that are able to ________ in extreme environments.
A. survive
B. discover
C. strike
D. be aware of

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Gerunds and Infinitives › ViewIt’s getting late. We should better _____________ much longer. (not stay)
A. to not stay
B. don’t stay
C. not stay
D. not staying
Grammar › View
Mario _______ to listen to jazz music all day
A. love
B. loved
C. is loving
D. loves
Phrasal Verbs › ViewTo invent
A. make up
B. look on
C. come to
D. carry over
Vocabulary › View
What does “inhalation” mean?
A. A sudden breath
B. An in-breath
C. A slow breath
D. An out-breath
