What are the things on which the supremacy of the west is based?

Dr. jekyll he told it cause it happened to him

  i think you forgot to put the options but if your reffering to this question then your answer will be "b"  a. add "to" to the base form to create an adjective.b. when the subject of a sentence is singular, add "–s" to the base form.c. add "–ed" to irregular base forms to form the past participle.d. do not use a base form with plural subjects

Slap.without warning, the gorilla hit the glass of his enclosure. tourist dropped their cameras.