45,has written
46.is
47.does she buy
48.doesn't  phone
49.takes 
    is driving
50.is falling
51.waters 

45. writes
46. are
47. buy
48. doesn't phone
49. takes
50. is falling
51. waters

1.My old friend, Manh (write).....writes...........to me twice a month
2.What shesays(be)..is....true
3.Where she (buy).....does she buy......her breakfast every morning?
4.Bi often (not phone)..doesn't phone....to me
5.Mrs.Green always(take).... takes ....a bus to work.But now she (drive) . drives.....to work
6.Look!The ball(fall).... is falling......down
7.He usually( water).....waters.....the trees in the morning