----How many books are left？
---- .
| A．Nothing | B．No one |
| C．Not many | D．None |
I _____ in the sky now.
A. is flying B. am flying C. flew
My friend ______ a birthday present for me last Sunday.
A. buy B. buys C. bought
He is eating dinner, _____ then the telephone rings.
A. and B. but C. or
We are _____ the supermarket now.
A. at B. under C. on
They ________ for twelve hours a day.
A. eating B. eats C. eat