A.operating | B.designing | C.replacing | D.Exploring |
A.spent | B.being spent | C.to spend | D.was spent |
A.To ignore | B.Ignored | C.Ignoring | D.Being ignored |
A.crossing | B.cross | C.to cross | D.in crossing |
A.only to learn | B.to learn only | C.only learned | D.only learning |
A.explaining | B.to explain | C.being explained | D.explained |
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