Which are the problems you face when teaching listening? Ha

Which are the problems you face when teaching listening? Harmer (2007) states that good listening lessons go beyond the listening task itself with related activities before and after the listening. He also points out some of the problems students face when they are listening to the English language. Read the problems and some examples and then check the correct option.
I. Students generally don’t recognize vowel sounds, diphthongs or minimal pairs, for instance: live – leave
II. They face problems in listening to connected speech, for example: /How’zit going?/
III. They don’t understand weak forms such as in /ai k n s ki/
IV. Students generally don’t understand phonetic links such as in /He works saz an engineer/