[ Perfect Modals ]
They ________ been in such a rush. They forgot all their belongings.
A. shouldn’t have
B. must have
C. might have
D. would have

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Prepositions › ViewFour-fifths of the world’s computers use programs ________ English.
A. at
B. in
C. on
D. about
Grammar › View
What are you worried about … him?
A. to meet
B. meeting
Grammar › ViewWhich is correct?
A. The popularity of GX is a riposte to suggestions that young people are uninterested in development.
B. The popularity of GX is a riposte to suggestions that young people are disinterested in development.
a, an, the, Zero Article › View
He lives in ___ Alaska.
A. A
B. An
C. The
D. Zero article