B/
1. I am (very) proud of my sister because she always studies well.
2. Yesterday the teacher said (that) I should work harder to improve my English grammar.
3. Jenny has Math three times a week.
4. We received the report two days ago.
5. My mother tole me to spend more time on History.
6. Last semester she got good grades in Science, but the Chemistry results were poor.
7. His grandmother told him to write her once.
8. His mother is very sad because he studies very badly every semeter.
9. Bao spends his free time doing volunteer work.
10. Song always plays soccer every Saturday afternoon, but last Saturday afternoon he played basketball.
11. We raise funds by collecting waste paper and broken glasses.
12. We are going to clean the lake's bank in the weekend.
