Here is some advice for you.

Wearing used clothes such as your brother's，sister's or dad's old T-shirts means you __27__ energy;and don't forget __28__ the lights when you leave a room and turn off your television and computer when they are not __29__!Besides，taking a bus saves a lot of oil every year.Also open a window and try not to use the air conditioner (空调).If necessary，set the temperature __30__ in summer and lower in winter to save energy.It isn't good to use paper cups，bags or boxes in our daily life.

(D)21.A.cool B.hot C.cold D.warm

(A)22.A.During B.For C.Since D.After

(A)23.A.climbed B.went C.arrived D.got

(C)24.A.increase B.improve C.cut D.break

(B)25.A.yellow B.green C.black D.blue

(A)26.A.Five-Year B.Five-Years

C.five years D.five year

(C)27.A.use B.find C.save D.keep

(B)28.A.to turn on B.to turn off

C.to turn up D.to turn over

(A)29.A.in use B.on business

C.at present D.for fun

(B)30.A.stronger B.higher

C.taller D.quicker

Ⅲ.补全对话。(2013，菏泽)

根据对话内容，从方框中选择合适的选项补全对话。

Li Yang：Good morning，Mathew.

Mathew：Good morning，Li Yang.31.__F__

Li Yang：There's still smog (雾霾) today.We'll have to go to school with face masks (口罩).

Mathew：32.__D__ According to the news，PM 2.5 pollution is the main problem with air pollution.

Li Yang：Yes，and air pollution has done harm to people's health.

Mathew：So the Chinese government and Chinese people must take actions to fight it.

Li Yang：33.__B__

Mathew：Since PM 2.5 is mainly caused by vehicles (机动车) and factories，cars with large emissions (排放) should not be allowed and factories should be closely watched.

Li Yang：34.__E__ We hope that more and more people will join us in making the blue skies return for good.

Mathew：35.__A__

A.I hope so，too.