Present and Past Speculation

The key ................ somewhere here but I can't find it right now.

You .................... remember me - we met on a trip to China last year.

What, you forgot your ticket and passport? You ................. be serious!

You failed the exam, so your answers................. have been wrong.

I'm not sure if you are right. You ................... have made a mistake.

I ............... my mobile at the hotel, but I don't remember.

Susan has been travelling for the last two weeks - she must ........ very tired by now.

Wendy's accent is a bit strange. She .... ... ............Northern Irish, but I'm not sure.

You ..................... Joe in town at noon - he was at home with me.

Thomas has been really upset recently. He ....................problems at home.

The house is dark. They ..................out.

I don't know where she is. She .............at the library.