I didn't hear the phone ring.

1. I just went out. /I was just taking a shower and didn't hear the phone ring.

2. I didn't receive your short message/email.

I want to rent a house near here. The rent of the old house was too high.

4. If you rent a house, what is the monthly rent?

I set the alarm clock at 6:00 in the morning, but it didn't go off.

It was already dark when I got there.