1 . 单句改错
1. The pork on cold day can keeps fresh.
2. The question is that whether she will speak at the meeting.
3. You can’t return the MP3 now. You may keep it until next month.
4. I will go to his birthday party if he invited me.
5. Her pen was broken. She buys a new one last week.
6. She can’t help cry when she heard the bad news.
7. He arrived at the railway station only find the train gone.
8. His parents can make the plan finishing on time.
9. Thirty years are a long time for every one.
10. This is the most wonderful film which we have seen.

5 . 他沉溺于电脑游戏，那就是他不得不辍学的原因。（that’s why....句型）
He was addicted to computer games, and ______________________________.