----Must they clean the classroom now?
----No, they ______.
| A．can’t | B．needn’t | C．mustn’t | D．don’t |
—Are you interested in learning math?
—Yes, but I’m afraid to _______ too much time on math.
| A．take | B．spend | C．pay | D．cost |
If you have trouble pronouncing the word, you can repeat it over and over again _______ you are comfortable with it.
| A．unless | B．if |
| C．until | D．while |
—I will take an important test tomorrow.—Oh, really? _______!
| A．Good luck | B．Have a good time |
| C．Well done | D．Good idea |
What is the logo of the 2014 Brazil World Cup ? 
—How do you like the scarf?—I love it. It feels _______.
| A．hard | B．cool |
| C．sweet | D．soft |