A.to seeing B.to see C.seeing D.to have seen
A.children are allowed B.are children allowed C.children will allow D.will children allow
A.was;since B.is;that C.will be;when D.was;before
A.made convenient B.made it convenient C.made it convenient for D.made it convenient to
A.any topic B.which topic C.whichever topic D.the topic he thought it