Math is _____ difficult for some students _____ learn.
A. too, to B. enough, to C. much, to
You can stay here , _______ you can leave at once.
| A．and | B．but | C．so | D．or |
.----I’d like a cup of black coffee. What about you, Maggie?
--- I prefer coffee______ sugar.
| A．than | B．for | C．with | D．to |
They thought ________ important to look left and right when ________ the road.
| A．it’s, cross | B．it, to cross |
| C．it, crossing | D．it was, to cross |
The guide said that much attention must __________ these details.
| A．pay | B．be paid |
| C．pay to | D．be paid to |
He couldn’t ________an answer when I asked him why he was late.
| A．come over | B．catch up with |
| C．come out | D．come up with |