—Are you sure you have to? It’s been very late.
—I don’t know ______ if not now.
| A．where can I do it | B．why did I do it |
| C．when I can do it | D．how I will do it |
We should _____ the power when our TV or computer is not used.
| A．turn on | B．turn off |
| C．turn up | D．turn down |
The mobile phone has influenced people’s life a lot since it ______.
| A．invents | B．invented |
| C．is invented | D．was invented |
Kim Soo-hyun(金秀贤) as well as other actors in You Who Came From The Star______ very popular these days.
| A．are | B．is | C．was | D．were |
The purpose of new inventions is _______ life more difficult, but to make it easier.
| A．not make | B．not making |
| C．not to make | D．do not make |
－Do you know Earth Day?
－Sure, it _______ in 1970 to tell us to protect our earth.
| A．gave up | B．sets up |
| C．was given up | D．was set up |