12) we were very impressed by her effort to overcome difficulties

14) they haven't writen to each other for five years 

15) he has learned english since he was in grade 6 

16) the last time i visited the museum was three months ago

17) tom has been ill for 3 days 

18) we started working on this programme five years ago

19) in 2008 our teacher began to teach extra classes for student with learning disabilities 

20) we have already created a resource room for talented students with learning disabilities 2013 

21) we have won the UNESCO charity award three times 

#studywell~~

       -jane-

12.We were very impressed by her effort to overcome difficulties.

13.My friends have studied English  for fifteen years.

14.They haven't written to each other for five years.

15.He has learnt English since he was in grade 6.

16.I last visited the museum was three months ago.

17.Tom has been ill for three days.

18.We started working on this programme five years ago.

19.In 2008 our teacher began to teach extra classes for students with learning disabilities.

20.We have already created a resource room for talented students with learning disabilities since 2013.

21.We have won the UNESCO charity award three times since 2011.