. Viết dạng đúng của từ trong ngoặc để hoàn chỉnh các câu sau. (0,8 điểm)
1. Isaac Newton is one of the greatest__________ in the history of human beings. (physic)
2. The government has introduced some__________ measures to reduce unemployment. (effect)
3. You shouldn’t spend money__________ like that, please save for a rainy day. (necessary)
4. I’m sorry that I have__________ what you said to me. (understand)
