根据上下文意思用所给单词的适当形式填空或者填入所缺单词。
How can you get the most information from a book? Here are some____ (suggest)that can help you read effectively（有效地)．
Read the whole thing．
When you're learning something by reading，it's____ (important)to have a general idea than to understand every detail．In fact，no matter how____(careful)you read，you won't remember or understand all of the details．So ____(remember)the main points will be OK．
Decide how much time you will spend．
If you know that you have only six hours____a book，it'll be wise of you to adjust(调整) yourself．The more clearly you know your limits(限制)，the more effective your reading will be．So never start to read without planning when____(stop)．
Have____purpose．
Before you begin，find out____you want to read this book．If you don't have reasons of your own， you can't learn much．After you start to read，try to think of four____(question)：Who is the writer? What are the book's opinions? What are the reasons? What are the conclusions?
Read it three times．
You'll get the most out of the book ____you read it three times—fast-reading for general ideas，reading for understanding，and then reading for note-taking and remembering．
的直线l与直线
的值为( )．