We already have ______pencils, but we need two ____ pens.

(2013·衡水中学二模)Good shoes, clothes and a backpack are the basic ________ you need for your hiking.

Harry telephoned to the airport to______ whether Flight 24 for San Francisco is departing on time.

Teenagers ______ social experience, so they are easily ______   when they first step into society.

The boy talked his mother _____ buying him a home computer.