Effective measures should be taken to ______ the rare species _______ being over-killed by human beings.

I can’t find my purse anywhere . — You ___ have lost it while shopping .

Did the book give the information you needed ? —Yes. But _____ it, I had to read the entire book.[ ]

He is a deep thinker _____ opinions are worth much

I have the details _________ here in my notebook , which you can refer to.