有几篇短文改错,Yesterday my English teacher asked each student writ

有几篇短文改错,
Yesterday my English teacher asked each student write
a composition title "The Greatest Achievement of My
Life".I was not sure what to write about it.I've thought
it over for a long time.I did many things.Coming to
America,get a job and meeting new people were my
achievement.I think my greatest achievement was
learning English.Sometimes I didn't understand everything
people were saying,but each day I got better or better.
I told my teacher this was difficult composition to write.
Above all,it is hard to measure everything you have done
in your life.
Dear Helen,
Thank you so much for your party at Christmas Eve.All
of them enjoyed it very much.We liked the dishes you had
cooked but we were happy to learn the English songs you taught
us.We hope you'll teach us a lot many songs in the future.
We're leaving from our hometowns to spend the winter
vacations.It seems that many of us are homesick after
being away from home for such a long time.What are your
plans?Will you join in the tourist group organized by our school?
We're busy prepare for our trips.Please excuse us
for not able to say goodbye to you.
A new comlietely dark restaurant has open in Berlin,
Germany.Diners cannot see what they eating and they have
to be guided to their tables by waiter.Twenty-two of the
staff are blind people.The restaurant ,that opened on September
4,2002,aim to help guests focus on all of their senses rather
than just they sight.Guests are saying to have a special experience of tasting,feeling or smelling.In the black
restaurant,diners cannot choose complete dishes from the menu but they can decide whether they want a fish,meat or vegetarian
meal.A average meal lasted about three hours.And at the end of
the night,the waiters tell the customers what they have been eating.
每行有一个错误或没有错误,请帮忙改出,感激不尽!
后两篇能不能也帮帮忙