I ______ have worried before I came to the new school, for my classmates here are very friendly to me.
| A．mightn’t | B．mustn’t |
| C．needn’t | D．couldn’t |
This project requires close teamwork.________ will be achieved unless we work well together.
| A．Nothing | B．Anything |
| C．Something | D．Everything |
To her joy，Della earned first the trust of her students and then ________of her colleagues.
| A．that | B．one |
| C．ones | D．those |
I’ve lived in New York and Chicago，but don’t like ________of them very much.
| A．either | B．any |
| C．each | D．another |
Recycling is one way to protect the environment；reusing is________.
| A．another | B．the other |
| C．one another | D．one |
At our factory there are a few machines similar to ________ described in this magazine.
| A．them | B．these |
| C．those | D．ones |