mình ghi đáp án sau sửa nha:
4. She has the lowest score. she should practice more
5. it's very cold outside. you should wear a coat
6. let's go on a picnic tomorrow
7. we're going to finish the project this month, let's travel
8. mary doesn't have any ideas. How about Linda
9. how about playing badminton every morning
10. he shouldn't have such scrude manners