[ Modal Verbs ]
I __________ exercise regularly to keep in good shape; it’s important.
A. must
B. have to
C. can
D. ought

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Vocabulary › ViewWhat is the meaning of the word “lucid”?
A. Confusing
B. Clear and easy to understand
C. Dark
D. Ambiguous
Grammar › View
Find the best combines each pair of sentences.
Some kinds of fish live in freshwater. Others live in seawater.
A. Some kinds of fish live in freshwater, for others live in seawater.
B. Some kinds of fish live in fresh water, and others live in sea water.
C. Some kinds of fish live in fresh water, or others live in sea water.
D. Some kinds of fish live in fresh water, so others live in sea water.
Vocabulary › ViewProducers can make their own food.
A. True
B. False
Some vs. Any › View
I hope you don’t have ____ problem
· a. any
· b.some