Em hãy hoàn thành những câu sau bằng một cụm từ chỉ thời gian thích hợp.
1. We have a test after a fortninght. It means we have it.......................
2.We often spend one day of a month to go ona picnic. It means we go on a picnic.....................
3.We have English on Monday, Wednesday and Friday. It means we have it .............................