频度表达：on Monday, on Tuesday等介词用法 — 英语词汇题
题目
读句子，选择合适的介词填空，把完整单词写在横线上（每空一词）。
1. I go to the library ___ Friday afternoon.
2. ___ Sunday, I help my mother clean the room.
3. We have a music class ___ Tuesday.
4. My birthday party is ___ Saturday morning.