EX3.
1.am listening   2.are playing   3.eat  4.is written   5.am cleaning 
EX4.  
1.some   2.a   3.any   4.an   5.some 
EX5. 
1.She is 13 years old and she is in grade 8 now. 
2.She has younger brother and his name is Bruce ...
3.My father works on our farm in the countryside .
4.How many orange are there in the bag ?