He became a famous writer when he was ______ .
| A．in his fifty | B．in his fifties |
| C．in fifty years old | D．in fifties |
The students of Class Three _________ on the playground.
A. be B. are C. is
Tony and Betty _______ new students.
A. am B. is C. are
My sister _______ got a son.
A. have B. has C. is
_________ you got a big family?
A. Have B. Are C. Do
There ________ one basketball and two footballs on the floor.
A. are B. is C. be