Kids can practice their spelling by filling in the missing vowels for each picture on this fun worksheet.

To solve the problem, we need to fill in the blanks based on the images provided. Each image represents a word or phrase, and the letters are already partially filled in. We will deduce the missing letters by identifying what each image represents.

Step-by-Step Solution:

1. Row 1:
- Image: A car
- Word: CAR
- Filled: C _ A R
- Missing letter: B

2. Row 2:
- Image: A bus
- Word: BUS
- Filled: B U S
- Missing letter: A

3. Row 3:
- Image: A train
- Word: TRAIN
- Filled: T R A I N
- Missing letter: E

4. Row 4:
- Image: A police car
- Word: POLICE
- Filled: P O L I C E
- Missing letter: S

5. Row 5:
- Image: An airplane
- Word: AIRPLANE
- Filled: A I R P L A N E
- Missing letter: I

6. Row 6:
- Image: A boat
- Word: BOAT
- Filled: B O A T
- Missing letter: H

7. Row 7:
- Image: A bicycle
- Word: BICYCLE
- Filled: B I C Y C L E
- Missing letter: L

8. Row 8:
- Image: A motorcycle
- Word: MOTORCYCLE
- Filled: M O T O R C Y C L E
- Missing letter: R

9. Row 9:
- Image: A skateboard
- Word: SKATEBOARD
- Filled: S K A T E B O A R D
- Missing letter: D

10. Row 10:
- Image: A hot air balloon
- Word: BALLOON
- Filled: B A L L O O N
- Missing letter: H

Final Answer:

The completed grid with the missing letters filled in is:

```
C A R
B U S
T R A I N
P O L I C E
A I R P L A N E
B O A T
B I C Y C L E
M O T O R C Y C L E
S K A T E B O A R D
B A L L O O N
```

Thus, the solution is:

$$
\boxed{CABR, BUSA, TRAINTE, POLICES, AIRPLANIE, BOATH, BICYCLEL, MOTORCYCLER, SKATEBOARDD, BALLOONH}
$$