_____ of the new aircraft will start next year.
| A．produce | B．production | C．product | D．productive |
Hours of playing violent video games can affect the way the brain works, ______ damage to certain cells of brain.
| A．to cause | B．cause | C．causing | D．caused |
---What do you think is the matter with your car?
---Well, it _____ start at all. I mean I turned the key and nothing happened.
| A．shan’t | B．won’t | C．mustn’t | D．shouldn’t |
Women’s fashions are changing: One season they may favor pant-suits, but the next season they may prefer miniskirts.
| A．lately | B．shortly | C．relatively | D．constantly |
We can never expect _______bluer sky unless we create ______ less polluted world.
| A．a；a | B．a；the | C．the；a | D．the；the |
You can change your job, you can move your house, but friendship is meant life.
| A．of | B．on | C．to | D．for |