A.to question | B.to be questioned | C.questioned | D.questioning |
A.to deal with | B.dealing with | C.to be dealt with | D.dealt with |
A.not trying | B.trying not | C.to try not | D.not to try |
A.keep | B.kept | C.keeping | D.to keep |
A.to discover | B.to be discovered | C.discovered | D.being diseovered |
A.calling | B.call | C.to call | D.called |
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