What do the following phrases have in common? 

1. Clear the air

2. Acute arthritis

3. Now hear this

4. The art house

 

Answer:

 

Each phrase conceals the word EARTH, with its letters in correct and consecutive order:

 

1. clEAR THe air

2. acutE ARTHritis

3. now hEAR THis

4. thE ART House

 

Credit:

Stella Zawitowski