[ Modal Verbs ]
We ……………..leave immediately. The tsunami is coming.
A. mustn’t
B. have to
C. could
D. may

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Grammar › ViewA treaty ………..by President Truman many years ago.
A. signed
B. was signed
C. will sign
D. signs
Modals and Past Tenses › View
Which modal verb is used to express a past ability?
A. Can
B. Could
C. May
D. Must