tart early , _______ it is dark orlight

You’d better ______ ask old granny for help because her memory is getting poorer now.

Daniel is crazy about _____ DIY. ______ model plane he made looks very nice.

We should think of ways to stop the waste from the factory _____ our living environment

Tell me _______how it came about that you were 20 minutes late for classYou needn’t go into details