1.
Mind, heed, notice, regard, observe, mark, be attentive to, pay regard to, give heed to, take heed of, take notice of, give or pay attention to, give a thought to, be mindful of.
2.
Look after, look to, see to, oversee, overlook, superintend, supervise, take care of, provide for.
3.
Practise, pursue, follow.