When I came into the room, my computer was on. It

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 wasnt 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?
Theres
another thing I ________NOT/CAN__________ understand, I interrupted
Jim. My computers on but I always switch it off before leaving
home.Ok, stay at home. Ill be at _________YOU_________ place in half
an hour, he said and the phone went