Here are the best answers for each question:

**III. Choose the best answer a, b, c or d to complete the sentence:**

1. Exploring Japan's countryside offers a rich **b. experience**.
2. Many students memorize historical dates and events **a. to** only to pass exams.
3. Watching the sunset from the top of Machu Picchu was an **d. exhilarating** moment of awe and wonder.
4. To reach the remote village near the Himalayan foothills, we had to **a. climb a mountain**.
5. During our visit to Rome, Khang made sure to **d. explore** every corner of the Colosseum.
6. I turned bright red with **c. embarrassment** when I tripped over a tree root during my summer camp's hiking trip.
7. I planned the trip carefully, we ended up staying in a really bad hotel. **c. Since**.
8. After his solo trip to Europe, he felt like he **b. grew up** a lot and gained more experience.
9. Molly **a. has travelled** to Paris several times last year, but she hasn't toured the Seine River by boat yet.
10. "A: Have you searched for information on our history project?" B: "I totally forgot about it. I'll do it right now." **c. That's okay**.

**IV. Write the correct form or tense of the verbs in brackets:**

1. How many mountains **did you climb** (climb) so far?
2. It **was** (be) a memorable eco-tour to Cat Tien National Park last year.
3. It **started** (start) to rain heavily while the tourists **were exploring** (explore) the ancient ruins.
4. I **will not attend** (not attend) this summer's trip. It's so exhausting!
5. Kenny **travels** (travel) to new countries every summer to explore different cultures.