A.doubled | B.to double | C.doubling | D.having doubled |
A.Making sure | B.To make sure | C.Being sure | D.Make sure |
A.lacked | B.lack | C.lacking | D.lacks |
A.folded | B.folding | C.being folded | D.to fold |
A.grading | B.naming | C.ranking | D.grouping |
A.developing | B.developed | C.develop | D.develops |
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