Help out with daily household tasks, such as washing the dishes. Ask permission to use the telephone and pay adequately for your calls. This is very different, and more expensive, than the USA method of a monthly charge that covers local calls. Do not raid the refrigerator without express permission. Do not use excessive amounts of hot water.
Water is a precious and expensive commodity in many countries and cultures.
Be receptive to activities planned by your host family. Your homestay family and program leaders may well make arrangements to show you interesting sites in the area, but this may not always be possible during their work week. You should relax and be yourself. Try to be flexible and fit in with the family's routine. If you are unsure, try to take your cues from the family and ask polite questions.