Uzupełnij zdania odpowiednim czasownikiem modalnym lub konstrukcją have to we właściwej formie .
If you feel unfit and you think you do something about it try running . It' s easy you ..................................... do it anywhere and you ................ buy any special equipment except for some good running shoes . But there are important rules you ..................... follow . For example you .................................. start each run walking or slow running to warm up . And remember ............................ run on hard ground because ....................................... hurt your kness