Ask John ______ here at 7 pm tomorrow.

It is said that the gravity on Mars is only about __________ of the gravity on earth．

Everything seemed so fast and now it’s all over.

Nanjing, ________ old capital of the six dynasties, is becoming ________ more beautiful city for the coming 2014 Youth Olympic Games.

Mr. Wang is a teacher. He ______ in this school for 20 years.