(2013·高考浙江卷)Half of ________ surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears.

—Is Mike a diligent student?  —No，but he is a lazy one，if   ___         ．

The nutrients in _____falls into the ocean quickly become available to other living creatures.

whatever great achievements the future may have in store for China, ______ is likely that many of them will be born in Zhongguancun. 

I want to buy a car for my father, but haven’t found         he likes yet.