Sure! Here are the completions for the sentences:

**V. Complete the sentences with the correct form: present participle or past participle.**

1. The protestors marched down the street **waving** banners.
2. The two people **injured** in the accident are still in critical condition.
3. The city **chosen** for the next Olympics was one nobody had expected.
4. Not **wanting** to create a scene, she waited until her husband was alone before shouting at him.
5. The man **sent** to repair the TV set was useless.

**VI. Find and correct the mistakes in the following sentences.**

1. I was waiting for the train; I read some articles about global warming. (Add "I" for clarity: "While I was waiting for the train, I read some articles about global warming.")
2. The forest fire saw, the children immediately called the police. (Change to "Seeing the forest fire, the children immediately called the police.")
3. The students took part in green activities, planting more than 100 trees. (Correct as is: "The students took part in green activities, planting more than 100 trees.")
4. I sat by the beach; I kept thinking about how my life has changed. (Change comma to a semicolon: "I sat by the beach; I kept thinking about how my life has changed.")
5. Rising out of the sea in front of us, the sun started to warm our faces. (Change "Raising" to "Rising": "Rising out of the sea in front of us, the sun started to warm our faces.")

Feel free to ask if you need more help!