Vitamin C helps our bodies make a special chemical, which _______ affects our brains, making us feel happy.

I turned over the chinese vase by accident while I cleaned the desk and now it is _________.

It saves time in the kitchen to have things you use a lot _______ easy reach. 

Although the plan hasn’t been approved______ present, he insists______ carrying it out.

 I think it unwise to live ______ one’s income, as is the case with a lot of young people today, who often turn to their parents for help.