Sure! Here are the reordered sentences:

1. Lan missed the concert because her brother came down with a fever.

2. It's difficult to get around the city during rush hours.

3. Rose wants to carry out a plan for improving her grades.

4. Public transport is always packed with people in the city.

5. I like to hang out with my friends at the park after school.

6. Kelly wants to cut down on using reusable bags by reducing pollution.

7. My sister usually gets around Bangkok by sky train.

8. The dirtier the water is, the less safe it is to drink.

9. The fancier the dress is, the more expensive it looks.

10. The more crowded I feel, the hotter the room is.