________to work overtime that evening, I missed a wonderful film.
I don’t know who invented _______ telephone, it’s really _______ most useful invention.
I would appreciate ______ if you could let me know in advance when the meeting will be held.
--- How did your students express their thanks to you on Teachers’ Day? --- A gift, together with many flowers ______ sent to me by my students.
--- Why do you look sad?---There are so many problems ______.
--- What has happened here?--- There was ______ accident here about an hour ago. ______ car hit a tree and ______ driver was killed.