A. bought B. to buy C. buying D. buy
each having its special properties B. having its special properties
one has its special properties D. each has its special properties
A. considered B. be considered C. considering D. having considered
A. put B. to be putting C. to put D. putting
A. loading B. being loaded C. to be loaded D. having loaded
A. send B. to do sent C. being sent D. sending
A. broke B. break C. broken D. breaking
A. practice B. to practice C. practiced D. practicing
A. washed B. to be washed C. being washed D. to wash
A. to write B. written C. writing D. write
A. have you know B. have known you C. have you knowing D. have you known
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