The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
Nothing can persuade her to change her mind ______ it is made up.
| A．when | B．while | C．since | D．once |
—I’m going to Beijing tomorrow.
—What a ______! I’m going there too.
| A．opportunity | B．luck | C．coincidence | D．danger |
Your success has resulted ______ your hard work. His angry words resulted ______ a fight.
| A．from; from | B．in; in | C．in; from | D．from; in |
—How do you go to school?
—By walking. It’s ______ walking distance of my home.
| A．of | B．by | C．during | D．within |
Don’t be too ______ about things you’re not supposed to know.
| A．strange | B．amusing | C．curious | D．conscious |