For x Since = Present Perfect

I've been looking .................. my keys for the last 10 minutes. Can you help me?

I've had my computer ............... more than five years.

Have you been sitting here ............... long?

She hasn't been sleeping well .............. she flew back from Japan.

It's been raining ............... over three hours. When will it ever stop?

He hasn't used his car ............. he had the accident.

I haven't seen her ................. ages. Is she alright?

The house opposite us has been empty ............. the last 8 months.

My cat has been missing .................. Saturday night.

There have been rumors about the merger ............. last month.