Change into passive:

1. Why did they help him?

2. How many games has the team played?

3. Who are they keeping in the kitchan?

4. How can thay open this box?

5 what books are people reading this year?

6. how did the police find the lost man?

7. who will look after the dog for you?

8. how long have they waited for the children?

9. what time can the boys hand in their papers?

10. who lent you this book?

11. how many marks does the teacher give you?

12. Whn did your sister draw this picture?

giúp mình với

program tinh_tong_chan;

uses crt;

Var i,N,S: integer;

begin

clrscr;

writeln('nhap so n');

readln(N);

S:=0;

i:=1;

while i <= N do

begin

S:=S+i;

i:=i+1;

end;

Writeln('tong la: ',S);

readln;

end.

đây bạn nha

Cho các chất sau:
N₂O₃,KClO₃, ZnCl₂, FeO, ZnO, H₂SO₃, SO₂, NaOH
a) cho biết chất nào là oxit?
b) Phân loại và gọi tên các oxit ở câu hỏi a.