the explanation for subject and object questions thing

http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/1535_questionanswer/page53.shtml

Tiza = chalk

Tiza = chalk. There you can hear the pronuntation: www.macmillandictionary.com/dictionary/british/chalk

Dictionaries

http://www.wordreference.com

http://www.macmillandictionary.com

Pronunciation of Niger

http://www.thefreedictionary.com/Niger