1.  " I think one way is you must bear any useful word in your book in mind.

2.  It's not an easy work for me to prepare the hundreds of words useful in one unit.

3.  You listen to the tape and write down the exact words in your text-book so that you can learn to use the useful words or phrases that are new to you.

4.  In the class the teacher ill explain some language points and draw students' attention to some useful words and expressions.