Наша любимая грамматика :) When I came into the room, my computer was on. It worried me...

Наша любимая грамматика :)
When I came into the room, my computer was on. It worried me since I _________NOT/REMEMBER_________ switching it on. I looked around – there _________BE_________ nobody in my room and everything was in its usual place. Suddenly I _________UNDERSTAND_________ – the book had gone! I had left it on the table but it wasn’t there any more. I checked the window – it _________CLOSE_________. That meant that someone had come into the room through the door. My _________ONE_________ impulse was to call the police but I called Jim instead. “What _________HAPPEN_________?” Jim sounded sleepy. I explained that someone _________TAKE_________ the book. “Oh, no!” Jim sounded unhappy. “Have you any idea how valuable it is?” “There’s another thing I ________NOT/CAN__________ understand,” I interrupted Jim. “My computer’s on but I always switch it off before leaving home.” “Ok, stay at home. I’ll be at _________YOU_________ place in half an hour,” he said and the phone went dead.

I didn't remember
There was nobody
Understood
It was closed
First
Happened
Had taken
Can't
Your