Fill in the gaps with will or be going to and

Fill in the gaps with will or be going to and the verb in brackets.
1 He nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;(buy)
a new car next month.
2 Its so hot in here. I nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;(open)
the window.
3 I forgot to post that letter! I nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;
(do) it now!
4 Look at him! He nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;.(drop) that box