短文填空.

     Mr Smith offers us some advice on how to write a good composition , whichi

_______ the following steps.                                                                                                                    

                                                                                                                                   l.___________

     Firstly,we should read the topic c_______ and organize our ideas.

                                                                                                                                  2.___________

Then we start to shape our thoughts __________our own words and finish

                                                                                                                                  3.___________

our writingin theg__________time. After that . wehave tocheckour

                                                                                                                                  4.__________

compositions , payingattentionto _________ (语法) andspelling.Itis very

                                                                                                                                  5.__________

important to read them aloud to ____________(自己 ) or someone else from

                                                                                                                                  6. __________

_____________ to end. Lastly, we had better ask our teachers or classmates for

                                                                                                                                  7. __________

advice on how to improve our writing. If ________(可能) , we may leave

                                                                                                                                   8. __________

them alone for some time before reading again, ___________ will help a

                                                                                                                                   9. __________

a great deal. I hope you will b_______a lot from the advice above.

                                                                                                                                  10.___________

天然气具有热值高、污染小等优点．天然气的热值为q=4.2×10⁷J／kg，完全燃烧0.5 kg的天然气可放出      J的热量；铜和铅的初温相同，它们的比热容之比为3：1，质量之比是2:3,若它们吸收相等的热量，则铜升高的温度与铅升高的温度之比是        。