It’s snowing heavily outside. Put on your coat,_________ ,you’ll catch a cold.
| A．and | B．or |
| C．though | D．but |
What_______useful book it is! Yeah,it tells you how to play ______violin.
| A．an,the | B．a,a |
| C．a,the | D．an,a |
－We must act now because time is _____.
－Yes. Let’s start.
| A．coming out | B．running out |
| C．giving out | D．cutting out |
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 |