On feeling the earthquake,the teacher stayed calm in the front of the classroom,________ all the students to rush out of the classroom as quickly as possible.
—Have you been to the Great Wall? —Perhaps not in my memory; ____, it might have been during the early childhood.
It was reported that a little boy under a destroyed house for three days was pulled out alive at last.
The room___ 10 meters across is large enough for a single man to live in.
He is a strict and kind teacher, ______ my son loves and respects.
Helping others is a habit, ___ you can learn even at an early age.