Help with English

I'm having a bit of trouble with understanding the following questions.

1. Which one of the following pairs of words is a minimal pair for a pair of English sounds?
a) day & they b) fall & balls c) stretch & chase d) flap & flags

2. Which of the following words is pronounced with a consonant cluster in Australian English?
a) hoops b) race c) the d) march

3. Which of the following words is pronounced with a diphthong in Australian English?
a) stand b) through c) race d) with

4. Which one of the following words normally has stress on the second syllable?
a) sometimes b) beside c) pictures d) inside

Thanks heaps!