Please refer to the   before you switch on the engine.

Every time _______ I come across difficulties, I will turn to my parents for help.

At the sight of the scene of war, my _____ race back more than 50 years to the dark days of 1940.

I had no idea how to calm her down. At last  her strong emotion found       in loud crying.

The manager of the company told us that very little ________ was made of the waste material in the past.