While he was investigating ways to improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.
a ,/ B. a ,the C. /, the D. the ,a
The girl standing there looks a bit to me. I wonder if I have seen her somewhere before.
| A．similar | B．friendly | C．strange | D．familiar |
We have phoned her several times, but unfortunately she is still out of .
| A．reach | B．control | C．sight | D．order |
We should do all we can the children who lost the chance to go to school.
| A．help | B．to help | C．helping | D．to be helping |
---- You can take a walk daily if you want to keep healthy.
---- .
| A．Yes, that’s enough | B．Thanks for your advice |
| C．I like surfing the Internet | D．Well, that’s OK |
our earth, or else it will be no longer fit for us to live on.
| A．Protect | B．To protect | C．Protecting | D．Protected |