A. have
B. to have
C. having
D. had
A. typed
B. been typed
C. being typed
D. been being typed
A. equip with
B. equip by
C. be equipped with
D. be equipped
A. is made
B. has made
C. made
D. was made
A. be laughed at
B. to be laughed at
C. being laughed at
D. laughing at
A. are preventing
B. can prevent
C. prevent
D. can be prevented
A. is being installed by people
B. is be installed
C. is being installed
D. is been installed
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