Complete The sentence with had to/ didn039;t have to or could/

Complete The sentence with had to/ didn't have to or could/ couldn't.
a) Sorry I'm late. I ......... take the dog for a walk before I left.
b) I looked for my keys for ages, but I just ... find them!
c) I ... be home early last night.
d) We ......... go to school yesterday, so we played football at the park.
e) When Helen was eight, she ... swim really well.
f) I ......... answer the question, so I asked my teacher to help me.
g) We missed the last bus, so we ... walk home.
h) Sue ........ see the board, so she moved to another desk.