第一篇：
Last month,I went to the mountain village which （where）my
grandparents live.It is five years until（since） Ilast went there.Great
changes have been（been去掉） taken place in the past five years.Hardly had
I got off the bus than（then） a high water tower came into my eyes.Now
villagers can drink fresh water.Villagers no long（longer） use firewood.
Marsh gas,a new type of cheap and clean energy,make（makes） it very
convenient to cook and light.As(改为what) impressed me most was that the best
building in the village is the school.There（where） all children can receive
good education.I was greatly shocking（shocked） to see all the changes in the
countryside.I believe the villagers will have （+a）better life in the future.
第二篇:
Yesterday Mr.Smith,（+who’s）from Canada,gave us a lecture
about his country.As a （the）second largest country in the world ,
it covers with（with去掉） about a quarter of the world's land area .
But it's （its）population is very small,about 32 million.
People in Canada mainly say（speak） French and English.The
weather in Canada is quite differently（different） from area to area.
There are many lakes in Canada ,which supply them（it 指加拿大） with
one three （third）of the world's fresh water .Canada also has a lot
of forests which makes（make） it the biggest producer of paper in
the world .Beside(Besides) ,Canada also has much beautiful scenery.
第三篇：
There is a (an)old couple living near our school.
They have lived （led） a simple and peaceful life until
the husband was diagnosed with（as） a rare illness.
A lot of attempt（attempts） had been made to hide the
fact which the old man （+had）developed a serious illness .
Therefore(However) ,he finally learned the secret .Instead of
losing his （his去掉） heart ,the old man hugged his wife tightly ,
convincing her that he wouldn't easy (easily)give up .Many
a person (改为persons )were moved to tears ,including me .I always
believe God helps those whoever（who） help themselves
括号里就是改好的