Choose the correct form. a) there are more than a thousand sheep / sheeps on this farm. b) please accept my thank / thanks for your beautiful present. c) helen is the only person / people i know with three cars. d) there are two knife / knives in the top drawer. e) alan hurt his leg when he fell down the stair / stairs. f) kate decided to change her style and bought new cloth / clothes. g) paul found his belonging / belongings outside in the street. h) would you like to try a chocolate mouse / mice? i) world airways has bought 20 new aircraft / aircrafts. j) we have already sent the good / goods you ordered.б