I have been living in the United States for twenty years, but seldom_______ so lonely as now.
A. have I felt B. I had felt C. I have felt D. had I felt
Today’s teens don’t see anything strange in the fact _______the computer takes up a central place in their social lives.
A. which B. that C. where D. what
I _______to go shopping that Saturday, but the bad weather made me change my mind.
A. plan B. would plan C. had planned D. have planned
---______ the farmers discovered the entrance to the secret cave in the valley?
--- Totally by chance.
A. When was it that B. How was it that C. How it was that D. When it was that
One more month, _______ the grapes in the yard will be ripe.
A. or B. otherwise C. but D. and
_______these coins are of different shapes, sizes and colors, they all date back to a long, long time ago.
A. Since B. Unless C. Once D. While
