Choose the correct word to complete each sentence. Explain your reasoning.

Here are the answers to the vocabulary questions:

1. The correct answer is B.

   • "Excuse me, is this seat engaged?" "Engaged" means occupied or reserved, which is appropriate for a seat.
   • The final answer is $\boxed{\text{B. engaged}}$

2. The correct answer is A.

   • "The party composed of adults and two children." "Composed of" correctly describes what the party consisted of. Options B, C, and D contain grammatical errors or incorrect usage.
   • The final answer is $\boxed{\text{A. composed of}}$

3. The correct answer is A.

   • "Environmentalists believe we have to face up to the mess we have made on the planet." "Face up to" is a phrasal verb meaning to accept and deal with a difficult situation.
   • The final answer is $\boxed{\text{A. face}}$

4. The correct answer is B.

   • "The minister said the government is committed to preserving the national parks." "Preserving" means to protect something from damage or destruction, which is the correct term for national parks.
   • The final answer is $\boxed{\text{B. preserving}}$

5. The correct answer is C.

   • "I have been stung by a bee." Bees sting, they do not bite.
   • The final answer is $\boxed{\text{C. stung}}$

6. The correct answer is B.

   • "The prize was given on the honour of the class teacher." The phrase "in honour of" means to show respect or admiration for someone.
   • The final answer is $\boxed{\text{B. honour}}$

7. The correct answer is A.

   • "When he described his ideal woman to me, I wondered if he will ever find her." "Ideal" refers to a perfect or exemplary person in one's mind.
   • The final answer is $\boxed{\text{A. ideal}}$

8. The correct answer is B.

   • "Mary didn't want to be kept indoors all day." "All day" is the correct phrase meaning throughout the entire day.
   • The final answer is $\boxed{\text{B. all day}}$

9. The correct answer is D.

   • "My father was unable to pay my school fees because he was not wealthy." "Wealthy" is an adjective meaning rich, which fits the context of being unable to pay fees.
   • The final answer is $\boxed{\text{D. wealthy}}$

10. The correct answer is A.

    • "The three people had a heated discussion among themselves." "Among" is used when referring to three or more people or things. "Between" is typically used for two.
    • The final answer is $\boxed{\text{A. among}}$