there are three rolls of film on the ground改错

there are three rolls of film on the ground改错 There are two rolls of film on the ground ------ ------ ---- There are ( ) on the ground.A.two rolls of film B.two rolls there are three rolls of film in my pocket改错 There are tow roiis of film on the ground 改错 There are three rolls of film in my pocket.(改错） There are two rolls of flim on the ground有什么错 There are students on the play ground.改错 There are( )on the ground. there are 【 】[hundred] of people on the ground 介词填空 There are three film on（ ）City Cinema.The film is （ ）at There are three rolls of films .这句话有错吗?错在哪里?