I have three sisters. They are all ____________.
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