This is one of the means ____t he electic energy is conducted from one place to another.
| A．by which | B．by that | C．through which | D．through that |
His hard work paid______ when he got the result.
| A．back | B．over | C．off | D．for |
While typing, Helen has a habit of stopping ______ to give her long and flowing hair a smooth.
| A．now and then | B．over and over | C．up and down | D．here and there |
In order to ______ his muscle, Mike goes to the gym regularly to do exercise.
| A．sharpen | B．brighten | C．strengthen | D．deepen |
You were my ______ when I was weak; you were my voice when I couldn’t speak.
| A．ability | B．strength | C．energy | D．force |
---I bet you will go on a trip after graduation.
---______. I can’t wait!
| A．Surely I will | B．Go ahead | C．Take it easy | D．My pleasure |