1 These newspapers haven't been read yet.
2 Must the classroom be kept clean?
3 Yes,it can.
4 This probiem cann't be worked out very easily.
5 How long has paper money been used for?
1 These newspapers haven't been read yet.
2 Must the classroom be kept clean?
3 Yes,it can.
4 This probiem cann't be worked out very easily.
5 How long has paper money been used for?