Please fill the gaps with suitable words:

1. I'm terribly sorry but I ....... what you said just now and I wonder if you could repeat it.
(a) wasn't listen to (b) wasn't hearing (c) didn't hear (d) didn't hearing

2. I ....... attentively to the lecture on philosophy but I still didn't understand much of it.
(a) heard (b) listened (c) was hearing (d) was listen

3. Can you ....... me all right over there because you are rather a long way away?
(a) listening (b) hearing (c) listen (d) hear