1 take off
2 put into use
3 safe landing
4 independently
5 knife is used for cutting (stuff)
6 Our life has been better in some aspect.
7 (1) In recent years,my hometown has being significantly changed.
(2) My hometown has been changed a lot in recent years.
(3) Over the years,my hometown has being greatly changed.
8 there used to a drugstore in here.
9 How many times has John been to the United States.
10 Is there any problem before the old airport closed?