Choose the suitable suffix for each verb.

Choose the correct option.

Companies try to advert[ate|en|ify|ise] their products in every possible way.

If you want to use this computer program, you have to activ[ate|en|ify|ise] it first.

His parents regul[ate|en|ify|ise] how much TV he can watch.

Astronomers class[ate|en|ify|ise] space objects into different groups.