It's possible she misunderstood you./ She ... you.

I'm sure they distributed all the leaflets. / They .... all the leaflets.

Obviously, they were trying to deceive you./ They ..... to deceive you.

I'm sure I locked the door!/ I .... the door.

Perhaps they aren't willing to part with their dog./ They ..... to part with their dog.

What's that terrible noise? I'm sure our neighbour is using his precious drill again!/ What's that terrible noise? Our neighbour ... his precious drill again!

It's so quiet in the house. I'm sure the kids are playing outside./ It's so quiet in the house. The kids .... outside.

I've seen Jim here several times. I'm sure he lives somewhere in the area./ I've seen Jim here several times. He .... somewhere in the area.

I'm convinced he did it intentionally./ He ... intentionally.

Perhaps they don't know whether to stay or go./ They ..... whether to stay or go.

Where's Sam? Perhaps he's hiding in the wardrobe./ Where's Sam? He .... in the wardrobe.

I'm sure she didn't mean any offence./ She .... any offence.