1) in
2) of
3) on
4) in
5) between
6) behind
7) next to
6. I didn't recognise Lucy, because she had grown her hair very long.
7. The man told me that he had been to Russia a few years before.
8. Everything was white and beautiful, because it had snowed in the night.
9. Because I hadn't made an appointment, the manager refused to see me.
10. When I had done the washing up I sat down and read the paper.
11. My hands are dirty, because I have been repairing the car.
12. I have not been enjoying my job recently.
13. George has been helping me in the office since Tuesday.
14. I have been having a headache since this morning.
15. Anthony has been away for the last few days.
# squaring the variable a
print('squaring the variable a')
a = input('enter the variable a ')
a = int(a)
a = a * a
print ('a ^ 2 = ', a)
зайди по ссылке, Run program
https://www.onlinegdb.com/r1vEjDAq7