Two words, replace one

[Bat]

Flying challenge

 

[Aurora]

Flying car

 

[Aria]

Volvo car

 

[Aurora]

Sports car

 

[Aria]

Sport competition

 

[Aurora]

Competition rewards

 

[Aria]

Class rewards

 

[Aurora]

Voting rewards

 

[Aria]

Voting sites

 

[Aurora]

Internet sites

 

[Aria]

Internet software

 

[Aurora]

Harmful software

 

[Aria]

Harmful bacteria

 

[Aurora]

Harmful chemicals

 

[Aria]

Harmful viruses

 

[Aurora]

Harmful effects

 

[Aria]

Unusual effects

 

[Aurora]

Interesting effects

 

[Aria]

Interesting facts

 

[Aurora]

Fun facts