Martin Cooper , a US researcher , was considered _______ the first cell phone .
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A
invented
B
to invent
C
having invented
D
to have invented
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Raising environmental awareness was the aim of our art exhibition ____ last week.
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A
to hold
B
held
C
having held
D
being held
_________ after a long walk, Kate called and said she couldn't come to the party.
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A
Worn out
B
Having worn out
C
To be worn out
D
To wear out
Every minute is made full use of _________ our lessons before the exam.
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A
studying
B
studied
C
to study
D
being studied
The music, ____________ pleasant, was soon well received when it was taken to the stage.
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A
sounded
B
being sounded
C
sounding
D
having sounded