[ Modal Verbs ]
When you visit countries with completely different cultures, make sure you know what you can and … do.
A. don’t have to
B. will have to
C. had to
D. mustn’t

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Modal Verb › Viewwhich modal verb is often used with I think and is used when expressing one’s opinion?
A. Can/Could
B. May/might
C. Have to
D. Should
Indefinite Pronoun › View
… is known about all the oceans.
- little
- few