Little children should go to school to learn something.______, they should learn how to behave well in social life.[ ]

.______ the traffic jam we should have arrived at the airport half an hour earlier

We must get up early tomorrow，______ we’ll miss the first bus to the Great Wall

_____ people died in Wenchuan 5.12 earthquake.

There is no denying the fact that as one grows older, one’s memory __________.