“Must I do the work right now, Mom?” “No, you ___. You may do it tomorrow.”
| A．mustn’t | B．must | C．needn’t | D．shouldn’t |
Green products are becoming more and more popular because they are environmentally ______.
| A．friendly | B．various | C．common | D．changeable |
Nobody could believe what Chloe says because she is ______ changing her mind.
| A．regularly | B．steadily | C．suddenly | D．constantly |
Don't ______.You will ______ new customs and different ways of thinking.
| A．lose your heart；apply to |
| B．lost heart；apply yourself to |
| C．lose your heart；adapt to |
| D．lose heart；adapt yourself to |
It______ a calm head to find the best solution to such a difficult problem within a short time.
| A．costs | B．takes | C．spends | D．needs |
By the end of 2007，about half a million people had flooded into the city，______ up around 10 percent of its total population.
| A．make | B．made | C．making | D．to be made |