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　　Plants are very important living things．Life could not go on if there were no plants．This is 　　1　　 plants can make food from air, water and sunlight．Animals and men 　　2　　 make food from air, water and sunlight．Animals get their food by eating plants and animals

　　　　3　　 Therefore(因此), animals and men need plants in order to 　　4　　 This is the reason(原因)why we find that there are so many plants around us．

　　If you look carefully at the plants around you 　　5　　 find that there are many kinds of plants．Some plants are large 　　6　　 others are small．Most plants are green．

　　Some plants have many small leaves．Others have only 　　7　　 large leaves．There are many kinds of leaves．Leaves are of 　　8　　 shapes(形狀)and colours．

　　Leaves are also different in other ways．Some leaves have short leaf stalks(葉莖)while others have long leaf stalks．Still others have ________9________ stalks at all．The edges(邊)of leaves are also different．Some leaves have smooth(光滑的)edges．Some have wave(波狀的)edges 10________ the teeth of saw(鋸)．

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A．why

B．because

C．how

D．that

A．don’t

B．not

C．cannot

D．can

A．too

B．either

C．a(chǎn)lso

D．a(chǎn)lready

A．eat

B．live

C．have

D．get

A．a(chǎn)re going to

B．may

C．certainly

D．will

A．when

B．yet

C．a(chǎn)nd

D．while

A．a(chǎn) little

B．a(chǎn) few

C．little

D．few

A．not

B．none

C．neither

D．no

A．like

B．a(chǎn)s

C．a(chǎn)s if

D．seem

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Swimming is very popular in summer．People like swimming in summer because water makes them 　　1　　 cool．If you like swimming but swim in a 　　2　　 place, it may not be safe．These years, more than ten people 　　3　　 while they were enjoying themselves in the water and 　　4　　 of them were students．But some people are 　　5　　 not careful in swimming．They often think they swim so 　　6　　 that nothing can happen to them in water．Summer is here again．If you go swimming in summer, don't forget 　　7　　 better swimmers have died in water．They died because they were not careful, not because they 　　8　　 swim．So don't get into water when you are alone．　　9　　 there is a“No Swimming”sign, don't get into water, 　　10　　．If you remember these, swimming will be safer．

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