Uzupełnij zdanie właściwym przyimkiem z ramki.   
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1. We had to cross ……………………… the wrong answers in the exercise.

2. I always flick ……………………… a book in the shop before I buy it.

3. The teacher asked us to read ……………………… the answers in class.

4. We have to fill ……………………… our application forms for the sports club soon.

5. We can’t turn ……………………… our papers until the exam begins.