4．Smoking

　　(forbid) in this office.

　　5．His interest in this subject gradually

　　(decrease)．

　　6．You are throwing

　　your chance of becoming a success.

　　7．The great people are the ones who make

　　difference to the world.

　　8．It isn’t them who use

　　the world’s resources.

　　9．The meeting was postponed

　　account of the chairman’s illness.

　　10．To be good care of every tree and bush，bird and mammal，be in harmony

　　nature.

　　Ⅰ.完形填空

　　Visitors to the dry，hot Sonoran Desert of the Southern Arizona and Northern Mexico are amazed at the many­armed giants.They are the saguaro cacti(树形仙人掌)，a giant which gives the landscape its

　　1

　　appearance.In the dry desert the saguaro cacti can live for more than 200 years，grow to a

　　2

　　of 20 feet，and have as many as 10 arms.

　　More

　　3

　　，the saguaro cacti still persist despite the unbearable desert climate.Those that have grown to old age have

　　4

　　droughts，freeze，flash floods，and bush fires as well as the

　　5

　　caused by groups of rats that eat their seedlings(幼苗)．Like all other desert

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