Here’s useful book . book is written by Bill Gates.
| A．a; The | B．a; A |
| C．an; The | D．an; A |
—Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.
| A．mustn't | B．can't | C．needn't | D．couldn't |
1 think drinking milk is good _ our health.
| A．for | B．to | C．with | D．at |
All of us find _ necessary to take exercise every day.
| A．this | B．that | C．them | D．it |
He has something wrong with his _ .He cannot see clearly.
| A．leg | B．eye | C．hand | D．arm |
Which sign is made for safety?