1.solar and wid......instead of fossil fuels within 20 years 
A.are used    B.will be used    C.will use     D.will be using 
2.humankind's future..........bright if they can utilize renewable energy in the future
A.is    B.was    C.will be    D.won't be 
3.we...........able to create a future that's free of carbon pollution by using renewale energy sources
A.will be    B.won't be    C.will be being    D.will have been

1.At 3o'clock tomorrow afternoon,I.........meeting on climate change

A.attended    B.have attended    C.will be attended    D.will be attending

2.the effects of climate change............ at the high-level conference next month

A.will discuss    B.will be discussing    C.will be discussed    D.was discussed

3.do you think renewable energy...........fossil fuels within 20 years?

A.will replace    B.is replacing    C.will be replacing    D.will be replaced    

C1.choose the word having the underlined part pronounced differently in  each line 
1 A.celebrate    B.costume    C.accept    D.candle
2 A.popular    B.flop    C.hover    D.programme

C1.choose the word having the underlined part pronounced differently in  each line 
1 A.celebrate    B.costume    C.accept    D.candle
2 A.popular    B.flop    C.hover    D.programme
C2.choose the word in each line that has different stress pattern
1 A.religious    B.performance    C.celebrate    D.minority
2 A.festive    B.abroad    C.perfrom    D.attend
3 A.alternative    B.generate    C.exhaustible    D.release
4 A.plentiful     B.pollutant    C.dioxide    D.machinery

A(x)=x^2 -3x+1-x^2

B(x)=6-1/3x

C(x)=x^2+2x

D(x)=4x^2-1

E(x)=2x^2+3x

G(x)=(-x+1) (x^2-1)

H(x)=9x^3-4x

k(x)=x^3+x

A(x)=x^2 -3x+1-x^2

B(x)=6-1/3x

C(x)=x^2+2x

D(x)=4x^2-1

E(x)=2x^2+3x

G(x)=(-x+1) (x^2-1)

H(x)=9x^3-4x

k(x)=x^3+x

use the cues given to write correct sentences

1.sientists/try/find/other alternative sources/energy

2.if we /able/collect solar energy/we/be sure/have enough power 3.energy/wind/use/centuries/move ships,grind grain,pump water/and/do other forms/work

4.recently/wind/use/generate electricity

5.for a long time/people/use water/power machines

6.today/water power/mostly/use/generate electricity

use the cues given to write correct sentences 

1.Almost all our energy/come/oil/gas/natural gas .we/them/fossil fuels.

2.the earth's fossil fuels/running out

3.we/use energy/the sun,the wind,and the water

4.the sun/supply/all the energy/used/grow plants/evaporate water/rain/and/maintain/temperature/planet

turn the following sentences into the passive 

1.they will install solar panels on the roof of our house next week

2.will the plumber check cracker on the water pipes in two days ?

3.they won't show the film on types of future energy into electricity