In the meantime, the question facing business is whether such research is ______ the costs.
| A．worth | B．worth of | C．worthy | D．worthwhile |
He sets us so difficult a problem_________ I couldn’t work out.
| A．that | B．as | C．which | D．why |
We think that it’s love, generosity and perseverance _______make the world ________ it is today.
| A．what; that | B．that; what |
| C．which; what | D．which; that |
It seems that living green is _______ easy and affordable. A small step makes a big difference.
| A．generally | B．fortunately |
| C．hardly | D．surprisingly |
Don’t wake Doctor Thompson up unless it is a real_________; he is too tired and needs a good rest.
| A．campaign | B．emergency | C．argument | D．connection |
---The girl looks so beautiful. Is she a model or a film star?
---________. She’s a teacher.
| A．You bet | B．Forget about it |
| C．Far from it | D．Whatever you say |