5предложений по временам pr.simple(active, passive),past simple(active,passive) всего должно получится 20.

Active voice1. i usually   make cakes on sundays. я обычно делаю торты по воскресеньям. 2. your friend drinks coffee in the morning. ваш друг пьет кофе по утрам. 3. students always read many interesting books. студенты всегда читают много интересных книг. 4. she often sings her favorite songs loudly. она часто поет свои любимые песни громко. 5. john seldom prepares dinner. джон редко готовит ужин .***************************************** 1/  i   played  computer games yesterday.2/  what  did he do  yesterday? - he    read  a book. 3/  she said that she  didn't like  this book and  tried  to find a more interesting one. 4/they  went  to moscow some days ago. 5/  you  did  this exercise last week. +++++++++++++++++++++++++++++++++++++++ passive voicethe  computer games  were  played by children  yesterday. tasty dinner  was cooked  by my mother last sunday. the floor  was  washed  in our flat yesterday. your homework  was done  yesterday. the table  was cleaned  by nina in the evening.************************************* the  computer games  are  played by children  every day. tasty dinner  is cooked  by my mother every sunday. the floor  is  washed  in our flat on fridays. your homework  is done  in the evenings. the table  is cleaned  by nina in the evenings.***************************************************

L(=2п/3)*r=(2*3,14/3)*7=~15см ответ: l=15 см