练习材料： [Day 2210 2020-10-13] Lesson 2 Breakfast or lunch? It was Sunday. ...

练习材料： [Day 2211 2020-10-14] Lesson 3 Please send me a card Postcards alw...

练习材料： [Day 2209 2020-10-12] Lesson 1 A private conversation Last week I ...