Here are the correct words or phrases to fill in the blanks:

**Exercise 3: Fill in each blank with a suitable verb.**

1. **ride** a bike
2. **drive** a car
3. **fly** a plane
4. **sail** a boat
5. **give** a signal
6. **fasten** a helmet
7. **wear** the seatbelt
8. **go** by air
9. **ride** a bike
10. **obey** traffic rules

**Exercise 4: Choose the correct meaning of the following words or phrases.**

1. pedestrian
- A. a person who flies a plane
- **B. a person who sails a boat**

The correct choice for the definition of pedestrian is **neither option A nor B**; a pedestrian refers to a person who is walking. However, if limited to the options given, neither fits precisely.