- something must be done to help the victims of the earthquake in mexico. -> Urgent
- it was careless of you to allow your 16-year-old son to drive your car. -> under no
- someone has suggested abolishing income tax. -> it
- thank you for reminding me about the timetable otherwise i would have missed the last train. ->if
1. Urgent actions must be taken to help the victims of the earthquake in Mexico.
2. Nếu viết theo "Under no circumstances" thì có vẻ như chưa hợp nghĩa lắm. Bạn check lại đề nhé
3. It has been suggested that income tax should be abolished.
4. If you had not reminded me about the timetable, I would have missed the last train.