.
______ it is to have a bath in the ocean in hot summer.
| A．How fun | B．How a fun | C．What a fun | D．What fun |
Some scientists have questioned the theory ______ CO2 is causing dangerous global warming.
| A．which | B．what | C．that | D．why |
They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
| A．has happened | B．happened | C．had happened | D．has been happening |
It's not how much money you make or who your daddy is ______ makes you the most attractive person in the world but the way you do some simple things.
| A．that | B．which | C．what | D．who |
A study has found that 80% of the people who ______ to be constantly distracted ______ more “working memory”.
| A．appears; have | B．appear; has | C．appears; has | D．appear; have |
In May 2011, Americans spent 53 billion minutes on Facebook, ______ it the most popular U.S. website.
| A．making | B．made | C．to make | D．having made |