Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
do you play football? Once a week.
are the kids reading? Silently.
are those books? They are 20 zlotys.
balloons did they buy? About 20.
long is the swimming pool?
lived there in the past? A prince.
is the longest river in Poland? The Vistula.
does Mark go to school? He goes to school in Oxford.
do people eat on Thanksgiving Day?
are you going to Britain? In July.