—Where is he exactly?—I don’t know, but I saw him _______ an experiment in the lab when I passed by.
I enjoyed the movie very much. I wish I ______ the book from which it was made.
104 John: Do you happen to have twenty dollars with you? Jack: _______ John: I want to buy a notebook.
. She insisted that she ______ somebody in the house.
——I must apologize for _______ ahead of time.——That's all right.
If you had not helped them, they ______ in London now.