Adopt the habit of speaking the truth. Correct?

[Naeem Afzal]

Hi teachers,

Get into the habit of speaking the truth. Correct?
Adopt the habit of speaking the truth. Correct?
Make a habit of speaking the truth. Correct?

If these sentences are incorrect, help me correct them.

Many thanks.

 

[a_vee]

This is all good!

"Get into" is the least formal, but nice work here!

 

[Naeem Afzal]

Can I also say?

Get into a habit...
Adopt a habit...
Make the habit...