Who were the boys in that struggle outside the school?

　　study

　　He studied for many years to become a doctor.

　　She studied the problem carefully before making her proposal.

　　stupid

　　You are not stupid, you have a learning problem.

　　There are no stupid people, only stupid mistakes.

　　subject

　　Everyone knows the subject of this meeting, so let us get started.

　　submarine

　　The submarine is in trouble at the bottom of the ocean.

　　substance

　　The new substance is a liquid that quickly changes to a solid when mixed with another chemical.

　　substitute

　　You can substitute this medicine for the one you have been using.

　　Jim is a substitute for Tom in todays game.

　　subversion

　　The three men are accused of subversion.

　　succeed

　　He succeeded in marrying her.

　　The team succeeded in winning every game that year.

　　such

　　She was surprised that they were interested in visiting such places.

　　Such people are never happy with their situation.

　　He had coins, keys, gum and such in his pockets.

　　sudden

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