Drunk driving used to occur _____, but now it is under control．

The question is _____easy, so everyone in our class can answer it.

As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.

 Our bodies are strengthened by taking exercise.  ________，our minds are developed by learning. 

"I wish you’d look at me when I'm trying to speak to you!" the teacher said      .