He will come to understand your efforts sooner or later. It's just a matter of______.
My mom allows me ______ computer games once a week.
Tom was so tired that he lay down and ________ quickly.
---What was your sister doing at this time yesterday? ---She was reading a magazine _______I was writing an e-mail at home.
When I came into the room, I saw a cat ______ under the table.
Peter ________ swimming at 8:30 yesterday evening.