It was Feb 8 2014 （Beijing） ___the opening ceremonies of the 2014 Winter Olympics ___ in Russia．
| A．that, broke off | B．before, put off |
| C．since, set off | D．when, kicked off |
North Korea fired a long-range rocket last month, but the launch was reported ______ in failure.
| A．to end | B．to have ended | C．having ended | D．ending |
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 |