To complete the sentences in the passage, the following words can be used:

1. **ended** – "Unfortunately, the holiday soon (1) **ended** and it was time to return home."
2. **excited** – "Liz was (2) **excited** as the bus drove through the countryside."
3. **calm** – "Everything looked (3) **calm** and peaceful."
4. **roadside** – "At four o’clock, the bus stopped at a small (4) **roadside** restaurant for ten minutes."
5. **arrived** – "The bus (5) **arrived** in Hanoi at..."

So the final passage is:

"The Robinsons had a great holiday in Nha Trang. Unfortunately, the holiday soon **ended** and it was time to return home. They took a bus back to Hanoi. Liz was **excited** as the bus drove through the countryside. She saw rice paddies for the first time. Everything looked **calm** and peaceful. At four o’clock, the bus stopped at a small **roadside** restaurant for ten minutes. Mr. Robinson was asleep, so Mrs. Robinson bought some peanuts and an ice cream for Liz. The bus **arrived** in Hanoi at..."