选词填空。
1. What do you do ________ Sundays? (in, on)
2. I study ________. (maths and art, Maths and Art)
3. I play football ________ 5:00 pm on Fridays. (at, in)
4. On ________ I usually go to the library. (Mondays, Monday)
5. ________ is it today? (What week, What day)
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