Only when class began _____ that he had left his book at home.
| A．will he realize | B．he did realize |
| C．did he realize | D．should he realize |
Half of ________ surveyed in 16 countries say they go first to their closest friend to share their deepest wishes and darkest fears.
| A．thesee | B．some | C．ones | D．those |
This project requires close teamwork.
________ will be achieved unless we work well together.
| A．Nothing | B．Anything |
| C．Something | D．Everything |
Recycling is one way to protect the environment，reusing is ________.
| A．another | B．the other |
| C．one another | D．one |
It's an either—or situation—we can buy a new car this year or we can go on holiday but we can't do ________.
| A．others | B．either | C．another | D．both |
The traffic on the main street has a longer green signal than ________ on the small ones.
| A．one | B．this | C．that | D．it |