20.The flowers ________ well if they ________.( )
| A. | won't grow,don't take good care of | |
| B. | won't grow,are not taken good care of | |
| C. | don't grow,are taken good care of | |
| D. | don't grow,don't take good care of |
19.Miss Green hurried to school without breakfast_______ late for work.( )
| A. | in order don't be | B. | in order to be | ||
| C. | in order not to be | D. | in order not to |
18.You'll be late for school________.( )
| A. | if you get up as soon as possible | |
| B. | unless you get up at once | |
| C. | until you get up right away |
15.Everything changed ________ quickly that I hardly had time to prepare.( )
| A. | such | B. | so | C. | very | D. | quite |
11._____ you can understand how the human body woks,you need to have some knowledge of chemistry( )
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| A. | As soon as | B. | Though | C. | So that | D. | Since |