______ book on the desk is ______ useful one．（ ）
| A． |
The； an |
B． |
A； an |
C． |
The； a |
The watch _______ you gave me keeps perfect time．（ ）
A．whoB．whatC．that
She went to a European university to study art．_______ university is really amazing．（ ）
A．AnB．TheC．A
He ________ in Zhuzhou since seven years ago．（ ）
A．worksB．workedC．has worked
The passengers _______ show their ID cards before getting on the plane．（ ）
A．mightB．mustC．could
Her birthday is ______ winter，the most beautiful season in a year．（ ）
A．inB．atC．on