[ Gerund or to Infinitive ]
I’m trying really hard ______ this text.
A. to understand
B. understand
C. understanding
D. understood

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Articles › ViewThe fastest animal in the world is ____ cheetah.
A. the
B. a
C. an
D. none
Grammar › View
Richard and Tom ________ excited last night.
A. was
B. are
C. were
D. is
The world (change, changes) so rapidly that we can hardly keep up.
A. Change
B. Changes
Perfect and Past Tenses › View
When I arrived, they………….. already (leave) __________ for the airport.
A. left
B. had… left
C. were leaving
