Câu 9: B

Câu 10: A

Câu 11: C

Câu 12: C

Câu 13: B

1A 2B 3B 4C 5C 6B 7C 8D 9D 10A 11A 12A 13D 14D 15B

Part 1

1 into

2 which

3 happily

4 aspect

5 if

6 compulsory

Part 2

1c 2f 3b 4g 5a 6e

Part 3

1 opened

2 to be finished

3 repairing

4 driving

5 harmful

6 modernize

7 environmentalists

8 effectively

Part 4

1 disappointing -> disappointed

2 come -> came

Part 5

1 succeed although he tried 

2 my father could speak

3 seen such an interesting 

4 being made to protect

Part 6

1 forest

2 climate

3 in

4 fortunatelt

Part 7

1T 2F 3F 4F

1 B

2 A

3 C

4 B

5 B

6 B

7 B

8 C

9 D

10 B

Đoạn AB: nước nóng lên.

Đoạn BC: nước sôi.

Đoạn CD: nước nguội đi.

PTHH: 2Al + 6HCl → 2AlCl₃ + 3H₂

PTHH: Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

PTHH: Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O

PTHH: K₂O + 2HCl → 2KCl + H₂O

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PTHH: 2Al + 6HCl → 2AlCl₃ + 3H₂

PTHH: Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O

PTHH: Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O

PTHH: K₂O + 2HCl → 2KCl + H₂O

\(\Leftrightarrow x+1=3x+9\\ \Leftrightarrow2x=-8\\ \Leftrightarrow x=-4\)