14. we were doing homework.
15. Alice took something (the object is missing).
16. she lost something (the object is missing).
17. Up to now, something has happened (the action is missing).
18. she has not thought about that.
19. Missing information.
20. We have made three cakes so far.
Her wallet had a lot of money in 1999.
She is wearing these clothes.
Are you playing games at present?
Have you ever done something like this?