10речень з прийменники будьласка

1.at 7:45 am I go to school
2.I got on my bike and said goodbyeto my friends/
3.I went to the river
4.I walked past the school
5. І was walking in the park
6.I go to a dance on Saturday
7.My friend is at school
8.She called at the door
9.I heard strange sounds at night
10.I brush my teeth in the morning