Mark the letter A,B,C or D to indicate the word whose main stress in placed differently from the rest. 1.A.physics B.history C.chemistry D.biology 2.A.important B.beautiful C.difficult D.excellent 3.A.activity B.correct C.camera D.banana 4.A.chicken B.museum C.hungry D.favourite 5.convenience B.crowded C.dislike D.exciting