Sentence examples similar to a key is mandatory from inspiring English sources

A helmet is mandatory.

Now a sweep is mandatory.

Only a guide is mandatory.

But a voice is mandatory.

A photo is mandatory.

So several times a week is mandatory.

A tuxedo is mandatory if you're a man.

Intense collaboration with a transplant center is mandatory.

A multidisciplinary approach is mandatory for patients with gastric cancer.

Therefore, a timely diagnosis is mandatory.

A quality degree is mandatory.