We can never expect ________ bluer sky unless we create ________ less polluted world.(2009·安徽)
| A．a；a | B．a；the | C．the；a | D．the；the |
He gave himself a new name to hide his ____ when he went to carry out the secret task.
| A．emotion | B．talent |
| C．identity | D．treasure |
When he was running after his brother, the boy lost his ___ and had a bad fall.
A. balance .chance C.memory D.place
Without his wartime experiences, Hemingway____ his famous novel A Farewell to Arms.
| A．Didn’t write | B．hadn’t written |
| C．wouldn’t write | D．wouldn’t have written |
Last year was the warmest year on record, with global temperature 0.68 ℃____ the average.
| A．below | B．on | C．at | D．above |
Like ancient sailors, birds can find their way____ the sun and the stars.
| A．used | B．having used | C．using | D．use |