policies, _______ to insure thatcompulsory education is truly free, ________ by the local government acrossChina since the start of school on September 1.

There is no doubt ______ man will conquer nature some day.[ ]

Listen! Someone is singing in the next room. Who ____ it be Is it Li Wei—No, it ______ be her. She is at school now.

Lingling __________ go to school at 7:00 in the morning.

.________ on the subject for half an hour,Liu Ying suddenly stopped.