D

1. in
2. in
3. at
4. on
5. on

giá vé giảm đi số tiền là:
      15 000-12 000=3000 (đồng)
Người ta đã giảm giá vé so với dự định số phần trăm là:
       3000:15000.100%=20% 
 Đ/s: 20%
 

B

26. D
27. A
28. A
29. B
30. A

1. I told Bill to keep all the windows open.
2. The guide asked me if i wanted to see the cathedral.

Ta có:
N=\(\dfrac{2003+2004}{2004+2005}\)=\(\dfrac{2003}{2004+2005}\)+\(\dfrac{2004}{2004+2005}\)
Ta thấy:
\(\dfrac{2003}{2004+2005}\)<\(\dfrac{2003}{2004}\)(1)

\(\dfrac{2004}{2004+2005}\)<\(\dfrac{2004}{2005}\)(2)
Từ (1) và (2) --> M=\(\dfrac{2003}{2004}\)+\(\dfrac{2004}{2005}\)>\(\dfrac{2003}{2004+2005}\)+\(\dfrac{2004}{2004+2005}\)=N
Vậy  M>N

26. Nga and Lan asked me where I studied English.
27. She said to me that she couldn't do that test.
28. They said to him that they were learning English then.
29. He said to me that he had to finish those works on time.
30. He told me to do that test again.

5.A
6.A

21. He told us to be careful.
22. She asked me if I sometimes had a party.
23. I asked her if there was a TV in the bedroom.
24. Nam told me not to eat too much.
25. She said to me that she would help me.