1.The letter isnt here because the post ..... this morning1)didnt arrived

1.The letter isnt here because the post ..... this morning
1)didnt arrived 2)didnt arrives 3)didnt arrive 4)doesnt arrive
2.I got a text message while l ...... for the bus
1)was waiting 2)waited 3)were waiting 4)was waited
3.When i was a child i ..... stay up late.
1)didnt used to 2)used it not 3)didnt use to 4)wasnt used to
4.I hope we ......on time
1)arrive 2)will arrive 3)are arriving 4)will be arrive