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V. Fill in each blank with a suitable preposition.

1. to

2. in

3. for

4. by

5. in

6. at

7. to

8. in

9. from

10. in

VI. Choose the best answer to complete the sentences.

1A

2D

3B

4C

5B

6C

7D

8C

9A

10B

\(3^x=84\\ \Rightarrow3^x=3^4\\\Rightarrow x=4\)

Vậy \(x=4\)