... C A A D
15.
D D C D C A
16.
B C D A D B
17.
D B B D D A
18.
C C D D B C
19.
A D D C A B
20.
A C C C B D
21.
C D D C B A
22.
C A D C C D
23.
D C B D C D
24.
B C B A C D
25. ... C B C D C
26.
A B C B D A
27.
C D B B C D
28.
B B B D C A
29.
A D D A D D
30.
C B D C A C
31.
A A A D D A
32.
A C B D D D
33.
D...
...
3.
B D C B A D
4.
C C D A B D
5.
A C D A A C
6.
C D D D C D
7.
A D B A D C
8.
D A C A D A
9.
D C B A B C
10.
D A B D D C
11.
A B C B B C
12.
A B C D D B
13.
B D A C D D
14. ... B C B D
27.
A B D B B D
28.
C D D A B B
29.
A B C B D C
30.
D C B C A B
31.
B C B B D B
32.
B A C B C A
33.
C C A C C C
34.
A B C D...
... B D A C A
3.
C A D A B D
4.
C B C D B C
5.
C D A B C D
6.
B D C C C D
7.
B A C B C A
8.
A B A D A B
9.
B D B D D A
10.
D B D A C A
11.
C C A D D B
12.
C D D B D C
13.
D ... C C D D
25.
B A C B D B
26.
C C A A B D
27.
C A B C C C
28.
A A A C D D
29.
D B B C B B
30.
C B B B C C
31.
D D A D A C
32.
D D B C B C
33...
...
B A D B D C
15.
A D C C C B
16.
B D B D D B
17.
D D A A A B
18.
B B A D D D
19.
D A A C C A
20.
A C D A D D
21.
D B C C D B
22.
C B A A D D
23.
C C C A A C
24.
D D A A D A ...
3.
D A C D B C
4.
D D B C B A
5.
B A C B D A
6.
A B C C A D
7.
D C D C A B
8.
B C B D C D
9.
D D D C D D
10.
A C B B A A
11.
D B D...
... C
13.
A D
B D B A
14.
B D
C A A D
15.
C B
C C D C
16.
C A
A A A D
17.
A C
A A D A
18.
A D
D D A A
19.
D B
D D B A
20.
C A
A A C D
21.
A C
A D A C
22.
C D
A C B A ... C
D C C B
24.
B D
D C C B
25.
B D
A C C C
26.
C D
A A D A
27.
C C
D C C C
28.
A D
B B B D
29.
B C
D B A C
30.
A B
D A C A
31.
D C
D...
... should study very hard B. must have studied very hard
C. must have to study well D. should have studied all the time
Câu 23: _______, they would have had what they wanted.
A. If they arrived ... lamp was invented ______.
A. oil lamps and then candles were used
B. candles and oil lamps appeared about the same time
C. candles and then oil lamps were used
D. people did not use any form ....