Вставить правильные слова! It started from a fortnress on the Khortytsia

Воткнуть правильные слова! It started from a fortnress on the Khortytsia Island In the middle of the River Dnipro. To travel by water the Cossacks _____(used,use,user) light boats. Such a boat ____(was,are,were) called a 39;chaika39;. The boat had two steering oars and _____(couldn39;t,can,could) easile sail in any direction. The Cossacks _____(sails,sailed,sail) down the River Dnipro to the Black Sea. Then they _____(crossed,cross,crossing) the sea. We _____(can,can39;t,could) tell exactly how _____(long,many,much) time it took them to travel to what is now Istanbull but they ____(got,are,where) therel.