Помогите вставить предлоги. Англ.язык.

Всю жизнь изучала французский,а тут надо сдавать английский. Переводчики - не то,помогите чем можете. Голову сломала,все книги перебрала - не одарена( Заранее спасибо Supply the prepositions where necessary. Write your answers in the boxes. a)She is sitting ___(1)___ the table and speaking ___(2)___ the phone. She is making an appointment ___(3)___ Friday. b)The meeting began ___(4)___ 10 o’clock and lasted ___(5)___ 2 hours. c)___(6)___ the other day Rossexport received an enquiry ___(7)___ the motors ___(8)___ Johanson & Sons. d)As we have done a lot ___(9)___ business ___(10)___ you we can give ___(11)___ you a small discount. ___(12)___ that case we’d like to have a discount ___(13)___ 7%. e)They offered to deliver the pumps ___(14)___ four lots ___(15)___ 12 pumps each ___(16)___ regular intervals ___(17)___ 5 months. f)Mr. Black agreed ___(18)___ the delivery terms and ___(19)___ payment ___(20)___ collection.