Say what you think happened in each situation. Put the verb in parentheses into the correct form with "must've":

Example:
We're lost. We _____ (take) a wrong tum somewhere.
Answer: We must've taken a wrong turn somewhere.

1. The radio isn't working anymore. It  (ran) out of batteries.
2. It's dark in the house. Somebody  (turn) out all the lights.
3. You have big bags under your eyes. You  (stay) up all night.
4. Maya's doll is missing its arms. She  (pull) them off.
5. You're all wet. You  (forget) your umbrella!
6. My laptop is missing from my office. Somebody  (steal) it!
7. I can't find my glasses. I  (leave) them at the office.
8. You got here in less than an hour. You  (drive) fast!
9. It's already 10 a.m. I  (oversleep).
10. Your French is fluent. You  (study) it in school.