Cho đoạn chương trình 

S:='anh la anh cua em';

If pos('em',s)>do

   delete(s,pos('em',s),2); 

Choose the underlined word or phrase that needs correcting:

Dolphins (A) are now (B) at risk  (C) due to their habitat being (D) polluted.

Giải thích đầy đủ giúp mình.

Nguyên nhân dẫn đến những đề nghị cải cách? Nội dung các đề nghị cải cách

dàn ý viết đoạn văn về vẻ đẹp thanh niên trong kháng chiến chống mỹ

Rewrite the sentences using SIMPLE PAST or PRESENT PERFECT TENSE
1. They haven't met for a month.
->It is
2. It is 3 years since Tom and Betty got married.
->Tom and Betty have
3. Have you ever seen a ghost before?
->No. This is the first time
4. Lan has not been absent from class before.
->This is the first time
5. The last time we went to the cinema was in December.
->We have
6. She has been on a diet for a week.
-> It's
7. My father began working in this factory five years ago.
->My father has_
8. This is the first time they have come to this restaurant.
->They have never
9. It's a long time since our last visit to Nha ->Trang.
We haven't
10. The last time I came here was in 2007.
->We haven't
11. I last saw her on Monday.
->The last time
12. We last played soccer together when we were students.
->We haven't
13. I learned in this school four years ago.
->I've
14. It is ten years since Mr Nam planted this tree.
->Mr Nam has
15. I haven't seen her for a long time.
->It's ages
16. I last met George two weeks ago.
->I haven't
17. They have been here for three months.
->They arrived
18. We started living in Istanbul 12 years ago.
->We have
19. I last saw my girlfriend five days ago.
->I haven't