* Choose the underlined part need correcting
26. If I am 10 centimeters taller, I would play basketball.
27. The nurses have to work very hard to make good care of all patients.
28. Fresh air and regular exercises are useful to our healthy.
29. I'm going to the Post Office for buy some stamps.
30. Teachers work hardly but don't earn much money
26. If I am 10 centimeters taller, I would play basketball. ( am → were )
27. The nurses have to work very hard to make good care of all patients. (make → take)
28. Fresh air and regular exercises are useful to our healthy. ( to → for )
29. I'm going to the Post Office for buy some stamps. ( for → to )
30. Teachers work hardly but don't earn much money (hardly → hard