Since there appears to be an implicit audio component to this task, I will provide a generic blueprint for how one can approach these types of questions based on typical listening comprehension exercises.

### Section 3: Listen and write "T" or "F"

1. ( ) I am in a beautiful world now.
- Generally, you will hear a statement and need to determine if it matches what you see written. For "I am in a beautiful world now," if the audio confirms this, mark "T" for True; otherwise, mark "F" for False.

2. ( ) Fishes were swimming in the dirty river.
- Listen for a sentence describing the condition of the fish and the river. If it matches the written statement, mark "T"; otherwise, mark "F."

3. ( ) Some birds were flying and playing in the sky.
- Note any mention of birds and their activities in the sky. Mark "T" if it matches, "F" if it does not.

4. ( ) I will make the sky green.
- Verify if the audio talks about making the sky green, an unusual statement. Mark "T" if true, "F" if false.

5. ( ) I will make the water clean.
- Again, listen and match the information. If it's in context with the audio, mark "T"; otherwise, "F."

6. ( ) I will also make the flowers bloom well.
- Confirm the statement through listening and mark "T" or "F" accordingly.

### Section 4: Listen and complete the passage.

1. One day, (1) **grandpa** and grandson are (2) **going** for a walk. It is hot, so they (3) **stop** for rest near a playground. There are (4) **many** children playing football. And the grandson wants to play, too. So he (5) **asks** grandpa, “How are your teeth?” The grandpa answers, “They are too (6) **old**.” The grandson is very happy. He gives an (7) **apple** to the grandpa, “Please look (8) **after** the apple for me. I will go to play football for a (9) **while**.”

### Section 5: Listen and choose the correct answer.

1. A. What is your mother’s name?
- Listen for the subject of the mother's name question.

2. A. There is a nice house near the river
- Subject-verb agreement: "There is" fits with "a nice house."

3. A. The school gate is very high and large
- Pay attention to degrees of comparison; "very high and large" is more common than "rather high and large."

4. A. My classmate and I are going on holiday
- Subject-verb agreement: "My classmate and I are going" is correct.

5. B. My sister is 16 years old and she is in class 10C
- Listen for the correct age and class information.

6. A. I live in Paris with my parents
- Prepositions matter: "with" correctly fits here as opposed to "about."

These are typical ways to prepare and comprehend audio-based questions in an exam or exercise setting. The exact answers will depend on the actual audio you listen to.