Without proper lessons, you could ____ a lot of bad habits when playing the piano.

int is not who said the words, _____they are true or not.

If you go by train, you can have quite _______ comfortable journey, but make sure you take _______ fast one.

How many students are there in the classroom —_____. They are all in the lab.

He is rather difficult to make friends with, but his friendship, ____, is more true than any other.