1£®You can take anything from the shelf and read£¬but please put__________the books when you've finished with them.

2£®According to an online survey£¬one­fifth of the college graduates haven't found__________(idea) jobs£¬which they studied for.

3£®There are many mistakes in his essay£¬__________(lead) to his failure.

4£®I don't think the necklace made of diamond is worthy__________(buy)£®

5£®Is it__________(worth)sparing some time for your hobby while your classmates are concentrating on their lessons?

6£®Experts say we should take more strict control of the Internet£¬so that we can protect our children__________harmful websites.